{"product":{"catalog_id":"24581410-2cd3-45dd-92f3-6b8d07640e87","is_eligible_search":true,"is_eligible_checkout":false,"item_id":"a2c30073-a0aa-442e-a0c6-f5da3bcf6006","title":"Essential Wool-Blend Vest London Fit - Semi-Slim","description":"The Essential Wool-Blend Vest from Le 31 by Simons is a tailored sleeveless waistcoat in a London semi-slim fit. It features a deep V-neck, piped pockets, and a satiny back with an adjustable strap for waist cinching. 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against a plain bright white background with soft even lighting; image shows upper body and part of jeans, slight motion in model pose and hair.","observations":[{"key":"Model and styling","kind":"feature","value":"Male model wearing a white dress shirt and a dark patterned tie underneath the vest; model is mid-action buttoning the vest.","regions":[{"x":0.16,"y":0.08,"width":0.68,"height":0.56,"confidence":"high"}],"evidence_status":"direct"},{"key":"Background and lighting","kind":"feature","value":"Uniform white background with even, shadow-minimizing lighting and soft shadow under the model's lower torso.","regions":[],"evidence_status":"direct"},{"key":"Crop and framing","kind":"feature","value":"Image framed from just above the head to upper thighs, showing vest front and partial jeans; slight left-to-right angle with model turned slightly to their right.","regions":[],"evidence_status":"direct"},{"key":"Image quality","kind":"feature","value":"Sharp focus on vest and hands; no visible motion blur except minor hair movement.","regions":[],"evidence_status":"direct"}]},"colors":[{"name":"solid black","part":"vest body","regions":[{"x":0.28,"y":0.2,"width":0.48,"height":0.52,"confidence":"high"}],"subject":"product","description":"Uniform solid black with a matte suiting finish, appearing even across the visible front panels.","sampled_hex":"#141215","estimated_hex":"#0B0B0D"},{"name":"dark black","part":"buttons","regions":[{"x":0.42,"y":0.36,"width":0.12,"height":0.3,"confidence":"high"}],"subject":"product","description":"Buttons appear dark, matching the vest color with a low-sheen finish.","sampled_hex":"#110E12","estimated_hex":"#0A0A0A"},{"name":"gold metallic","part":"decorative brooch","regions":[{"x":0.7,"y":0.31,"width":0.07,"height":0.13,"confidence":"high"}],"subject":"product","description":"Gold-tone metallic elements with a small pale stone or enamel detail and a short chain hanging from the 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It's designed to be worn as a standard suit vest, so we recommend ordering your usual suit size.","q":"How does the London fit semi-slim compare to other brands' regular or slim fit vests? Should I size up or down for a typical suit vest fit?"},{"a":"Official care instructions are not provided in the product listing. Given the wool-polyester blend with a satiny back and thin lining, dry cleaning is recommended to preserve the fabric and structure.","q":"What are the recommended care instructions? Is it dry clean only, or can it be spot cleaned or hand washed?"},{"a":"The variant is labeled 'Indigo/Dark Blue' — it's a deeper blue that may lean closer to dark navy than true indigo. The matching jacket (12016-219224) and pants (12016-219278) are designed as a set, so the color should match exactly.","q":"In the indigo/dark blue variant, is the color true indigo or closer to navy, and does it match the matching jacket and pants exactly?"},{"a":"The satiny back is a separate lining fabric (likely polyester or a similar synthetic satin), not the same as the front wool-blend. The adjustable strap allows for waist size adjustment, typically a few inches, but the exact range is not specified.","q":"Is the satiny back made of the same fabric as the front, and does the adjustable strap allow for significant waist size adjustment?"}],"reviews":[{"date":"November 22, 2024","title":"Tout est parfait","rating":4,"content":"J'aime le tisssu, sa souplesse. Très léger et confortable","reviewer_name":"Richard M."}],"target_countries":"US","canonical_url":"https://www.simons.ca/en/men-clothing/suits/suit-separates/essential-wool-blend-vest-london-fit-semi-slim--12016-219235?colourId=1","deep_research":{"dimensions":{"london_fit_sizing":{"title":"London fit semi-slim: how it measures and fits","entries":{"le_31_fit_hierarchy":"Le 31 uses Stockholm for slim, Berlin for regular/straight, and London for a semi-slim cut that narrows at the waist — so this vest is the brand’s middle option, shaped to avoid boxiness without the tightness of a full slim fit.","slight_stretch_fabric":"The wool-polyester blend’s slight stretch means the vest has enough give to stay comfortable over a dress shirt and to accommodate small size variations — between-size buyers can lean toward the smaller size for a cleaner fit without sacrificing comfort.","waist_narrowing_tailoring":"Because London fit explicitly narrows at the waist, the vest is pre-shaped to follow the torso — and the satiny back strap lets you pull it in further without alterations, which is valuable for anyone whose off-the-rack vests usually gap at the sides."},"entry_quotes":{"le_31_fit_hierarchy":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Blue--37a95117-4235-5e25-a6f3-dc8abef0e846/","quote":"Le 31 Mens Colourful stretch suit Stockholm fit - Slim Blue"},{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Blue--37a95117-4235-5e25-a6f3-dc8abef0e846/","quote":"Le 31 Mens Stretch piqué suit Berlin fit - Regular Blue"},{"url":"https://www.lyst.com/en-ca/clothing/le-31-stretch-wool-jacket-london-fit-4/","quote":"Our London fit jacket narrows at the waist and has regular sleeves."}],"slight_stretch_fabric":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Slight-stretch European fabric in a blend of wool and polyester made from recycled plastic bottles with thin lining"}],"waist_narrowing_tailoring":[{"url":"https://www.lyst.com/en-ca/clothing/le-31-stretch-wool-jacket-london-fit-4/","quote":"Our London fit jacket narrows at the waist and has regular sleeves."},{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Satiny back with an adjustable strap"}]},"entry_sources":{"le_31_fit_hierarchy":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Blue--37a95117-4235-5e25-a6f3-dc8abef0e846/","https://www.lyst.com/en-ca/clothing/le-31-stretch-wool-jacket-london-fit-4/"],"slight_stretch_fabric":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"waist_narrowing_tailoring":["https://www.lyst.com/en-ca/clothing/le-31-stretch-wool-jacket-london-fit-4/","https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"]}},"recycled_wool_blend_fabric":{"title":"Fabric blend and recycled content","entries":{"slight_stretch_for_all_day_mobility":"The fabric’s 'slight-stretch' property — built into the European wool-polyester weave — gives the vest just enough give to move with the wearer through reaching, sitting, and gesturing, preventing the binding that can afflict rigid tailored vests; this is a practical comfort gain for those who wear suits through long workdays.","wrinkle_resistance_and_shape_retention":"The polyester component inherently resists creasing and helps the vest maintain its structure throughout the day, so it emerges from a long commute or a desk-bound afternoon with fewer wrinkles than a pure wool vest — especially valuable for the unstructured back panel and adjustable strap that might otherwise show wear.","recycled_polyester_from_plastic_bottles":"The polyester content is made from post-consumer recycled plastic bottles, diverting waste from landfills and reducing dependency on virgin petroleum — a concrete sustainability advantage that sets this vest apart in the suiting separates market, where eco-conscious tailoring is still a niche differentiator."},"entry_quotes":{"slight_stretch_for_all_day_mobility":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Slight-stretch European fabric in a blend of wool and polyester made from recycled plastic bottles with thin lining"}],"wrinkle_resistance_and_shape_retention":[{"url":"https://ninghow.com/blog/wool-polyester-blend-fabric/","quote":"Wrinkle-Resistant & Shape-Retaining – Polyester reduces creasing and helps maintain structure."}],"recycled_polyester_from_plastic_bottles":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Slight-stretch European fabric in a blend of wool and polyester made from recycled plastic bottles with thin lining"},{"url":"https://sage.cnpereading.com/doi/10.1177/24723444241288280","quote":"Large volumes of plastic waste are currently being generated, posing a significant challenge for waste management. Refurbishing plastic waste into value-added textile products is one of the potent options for handling waste."}]},"entry_sources":{"slight_stretch_for_all_day_mobility":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"wrinkle_resistance_and_shape_retention":["https://ninghow.com/blog/wool-polyester-blend-fabric/"],"recycled_polyester_from_plastic_bottles":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","https://sage.cnpereading.com/doi/10.1177/24723444241288280"]}},"satin_back_vest_construction":{"title":"Satiny back and adjustable strap purpose","entries":{"adjustable_strap":"The adjustable strap on the back of the vest is not just a sizing fallback — it is designed to achieve a precise tailored fit, typically tightened to leave about 1 inch of breathing room; traditional tailors built in the strap knowing that gaining just 3-5 pounds would make a snug vest unwearable without it, so the adjuster lets the vest adapt to natural waistline fluctuations.","worn_sans_jacket":"Where tradition once dictated that a satin back should always be hidden, today it is common to wear a lining-backed vest without the jacket — the satiny sheen now reads as intentional formality rather than an orphaned suit piece, so you can remove your jacket and still look put-together.","suit_vest_lineage":"The satiny back on this Le 31 vest is a direct inheritance from tailored suit-vest construction where a smooth satin or cupro back allowed the waistcoat to glide effortlessly against the jacket lining, reducing friction and bulk — a functional detail that distinguishes a vest built to be worn as part of a proper suit rather than a standalone casual piece."},"entry_quotes":{"adjustable_strap":[{"url":"https://www.wikihow.com/Tie-the-Back-of-a-Waistcoat","quote":"Plan to tighten the cinch enough to leave 1 in (2.5 cm) of breathing room."},{"url":"https://www.askandyaboutclothes.com/threads/waistcoats-the-buckle-strap-in-the-back.110880/","quote":"Vests are one of the few items of clothing that could be worn quite snug in the traditional dress tradition. I have had a number of vests made for me, and they all come with adjusting straps and buckles in the back, on the assumption that a vest that is tight enough on the day you buy it without any strap will be unwearable if you gain even 3-5 pounds."}],"worn_sans_jacket":[{"url":"https://www.styleforum.net/threads/a-question-about-vests.269150/","quote":"These days though it is almost impossible to find a waistcoat with a self back, and I see people wearing lining-backed waistcoats without a coat all the time, nobody who isn't a member of StyleForum will know that there is anything wrong with this."}],"suit_vest_lineage":[{"url":"https://www.styleforum.net/threads/a-question-about-vests.269150/","quote":"It's an issue of style origins. Suit vests had a smooth back of satin, cupro, etc. so that they would slide smoothly against the lining of the suit coat. This also reduced warmth and bulk."}]},"entry_sources":{"adjustable_strap":["https://www.wikihow.com/Tie-the-Back-of-a-Waistcoat","https://www.askandyaboutclothes.com/threads/waistcoats-the-buckle-strap-in-the-back.110880/"],"worn_sans_jacket":["https://www.styleforum.net/threads/a-question-about-vests.269150/"],"suit_vest_lineage":["https://www.styleforum.net/threads/a-question-about-vests.269150/"]}},"value_comparison_similar_vests":{"title":"How it stacks up against comparable vests","entries":{"european_fabric_provenance":"Sourcing the fabric from Europe — a region known for established textile manufacturing — adds a subtle mark of quality assurance and design consciousness to the vest, elevating its perceived substance beyond the typical blended cloth used at this price.","canadian_designed_london_fit":"Designed in Canada and exclusive to Simons, the London fit is a proprietary semi-slim silhouette that gives the vest a distinct tailoring identity rather than relying on a generic international pattern block — a detail that matters for those who value brand-specific cut philosophy.","matching_suit_separates_system":"The vest is part of a full suit system with a perfectly color-matched jacket (SKU 12016-219224) and pant (SKU 12016-219278), enabling a three-piece suit build with the flexibility to choose different sizes for each piece — a practical bonus that single-vest-only SKUs cannot match.","satiny_back_and_adjustable_strap":"The satin back lining ensures the vest glides over a dress shirt without bunching, while the built-in adjustable strap allows for a customized waist fit right out of the box — two refinements that add genuine functional polish to the garment.","recycled_polyester_from_plastic_bottles":"The polyester in the wool blend is derived from recycled plastic bottles, fusing a tailored suit separate with a visible eco-story that separates it from the standard wool-poly vests that dominate the entry-level tailored market."},"entry_quotes":{"european_fabric_provenance":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Slight-stretch European fabric"}],"canadian_designed_london_fit":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Le 31 by Simons: an exclusive designed in Canada Our London fit"}],"matching_suit_separates_system":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Matching jacket also available: 12016-219224\nMatching pant also available: 12016-219278"}],"satiny_back_and_adjustable_strap":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Satiny back with an adjustable strap"}],"recycled_polyester_from_plastic_bottles":[{"url":"https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/","quote":"Slight-stretch European fabric in a blend of wool and polyester made from recycled plastic bottles with thin lining"}]},"entry_sources":{"european_fabric_provenance":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"canadian_designed_london_fit":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"matching_suit_separates_system":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"satiny_back_and_adjustable_strap":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"],"recycled_polyester_from_plastic_bottles":["https://www.stylight.ca/Item/Le-31/Mens-Essential-Wool-Blend-Vest-London-Fit-Semi-Slim-Black--278f89dd-fcb8-562a-a7e9-f91b336305cb/"]}}}},"handle":"essential-wool-blend-vest-london-fit-semi-slim-12016-219235","storefront_path":"/en/men-clothing/suits/suit-separates/essential-wool-blend-vest-london-fit-semi-slim--12016-219235","storefront_url":"https://ai.simons.ca/en/men-clothing/suits/suit-separates/essential-wool-blend-vest-london-fit-semi-slim--12016-219235"}}