
Le 31 x Thomas Mason
Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit
This is a long-sleeve button-front dress shirt from Le 31 by Simons, designed and made in Canada from 100% cotton poplin with a white ground and navy dual vertical stripes. It has a standard fit with a straight waist and shoulders, regular-fit sleeves, a point collar, a centered button placket, and barrel cuffs; the buttons are genuine Madagascan mother-of-pearl and are noted as delicate, so the garment should not be tumble dried. The fabric is labeled Thomas Mason, and the shirt is intended for business, formal, or smart-casual wear.
- Material
- 100% cotton weave
- Style
- classic, business, smart-casual, regular-fit
- Category
- Apparel & Accessories > Clothing > Shirts & Tops
Color
Specifications
Exclusive Canadian-made dual-striped poplin shirt with a standard fit and genuine mother-of-pearl buttons.
Dual-striped poplin fabric, standard fit with straight waist and shoulders, regular-fit sleeves, 100% cotton, and genuine Madagascan mother-of-pearl buttons.
- Material
- 100% cotton weave
- Style
- classic, business, smart-casual, regular-fit
- Occasion
- work, business-casual, formal
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Shirts & Tops
Additional Attributes
- Exclusive Le 31 by Simons design made in Canada
- Dual-striped poplin weave
- Bright, structured stripes with a soft, consistent hand feel
- Poplin fabric balances strength and sophistication
- Standard fit with a straight cut through the waist and shoulders
- Regular-fit sleeves
- 100% cotton construction
- Button-front shirt
- Genuine Madagascan mother-of-pearl buttons
- Delicate buttons; garment should not be tumble dried
- Downing poplin fabric named after the street of the British Prime Minister's official residence
Product Insights
Le 31 x Thomas Mason Numeric sizes 145–180 are collar sizes in inches: 145 = 14½, 150 = 15, 155 = 15½, up to 180 = 18. White ground with paired thin navy vertical stripes; matte, smooth poplin surface. Buttons are delicate; do not put the shirt in the dryer. 375 CAD buys Thomas Mason fabric, mother-of-pearl buttons and Canadian production, with no size upcharge.
Verified claims
- Fit
- Standard fit with a straight waist and shoulder, plus regular-fit sleeves.
- Sizing
- Numeric sizes 145–180 are collar sizes in inches: 145 = 14½, 150 = 15, 155 = 15½, up to 180 = 18.
- Variant
- One colourway, Patterned Blue, across all eight collar sizes.
- Material
- 100% cotton poplin.
- Fabric
- Downing poplin: bright, structured stripes with a soft, consistent hand and a balance of strength and sophistication.
- Design
- White ground with paired thin navy vertical stripes; matte, smooth poplin surface.
- Construction
- Point collar, centred button placket and single-button barrel cuffs.
- Buttons
- Genuine Madagascan mother-of-pearl buttons.
- Button care
- Buttons are delicate; do not put the shirt in the dryer.
- Ironing
- Iron at medium-high heat, about 150–200°C, while slightly damp and inside out or through a pressing cloth.
- Button cleaning
- Avoid acid cleaners, vinegar and harsh chemicals on mother-of-pearl; if needed, a brief 5–10 minute mild soap soak is gentler.
- Durability
- Cotton poplin is durable for regular wear, but the mother-of-pearl buttons need protection from heat, light, humidity and chemicals.
- Origin
- Made in Canada; exclusive Le 31 x Thomas Mason collaboration.
- Styling
- Wear with solid trousers close to the shirt's white ground, and add at most one other pattern.
- Styling troubleshooting
- If the outfit feels too busy, swap the patterned tie for a solid one before changing the shirt.
- Use
- Versatile for business, formal and smart-casual wear.
- Comfort
- Light, breathable cotton poplin with a soft yet crisp hand.
- Value
- 375 CAD buys Thomas Mason fabric, mother-of-pearl buttons and Canadian production, with no size upcharge.
- Size availability
- All eight collar sizes from 145 to 180 are in stock, including both endpoints.
- Measurements
- Use collar, chest and sleeve measurements from the size chart to choose between sizes.
Product record
- Title
- Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit
- Brand
- Le 31 x Thomas Mason
- Price
- 375 CAD
- Availability
- In stock
Image Analysis
2 images- 01

Product
Front view of a long-sleeve, button-front dress shirt worn by a model; shirt has vertical dual stripes, point collar, button placket and barrel cuffs, shown tucked into pants.
- Overall silhouetteLong-sleeve, tailored dress shirt shown from the front, tucked at the waist and fitted through the torso and sleeves.
1 region
x 0.14 · y 0.06 · w 0.72 · h 0.72 (high) - CollarPoint collar with visible collar points laying flat; collar band open at the neck without a tie.
1 region
x 0.36 · y 0.06 · w 0.28 · h 0.12 (high) - Button placket and buttonsCentered front button placket with small round buttons in a light off-white or cream shade, evenly spaced down the shirt front.
1 region
x 0.40 · y 0.18 · w 0.20 · h 0.48 (high) - Sleeve cuffsBarrel cuffs visible on both wrists with the same vertical stripe pattern; cuffs buttoned and sit at the wrist.
2 regions
x 0.12 · y 0.66 · w 0.18 · h 0.18 (high); x 0.70 · y 0.58 · w 0.16 · h 0.20 (high) - Vertical stripe patternEvenly spaced dual vertical stripes running the full length of the shirt front and sleeves; stripes appear as paired thin dark lines with white ground between repeats.
1 region
x 0.20 · y 0.18 · w 0.60 · h 0.60 (high) - Fabric appearanceSmooth, lightweight woven poplin appearance with a matte finish and crisp drape against the model.
1 region
x 0.24 · y 0.20 · w 0.52 · h 0.48 (medium)
Other
Studio lifestyle image showing a model wearing the shirt against a neutral light gray background; three-quarter frontal pose with one hand in pocket and soft even lighting.
- Model poseModel facing forward in a three-quarter frontal pose with left hand in trouser pocket and right hand relaxed at side.
1 region
x 0.12 · y 0.12 · w 0.76 · h 0.80 (high) - Background and lightingEven, soft studio lighting on a neutral light gray background producing minimal shadows and even color rendition.
- Visible non-product garmentsBlack trousers and a black belt with a silver rounded buckle are visible but are not part of the shirt product.
1 region
x 0.20 · y 0.66 · w 0.60 · h 0.26 (high) - Image framingCentered full torso crop showing head down to upper thighs; shirt is fully visible on the model front.
Colors
white· shirt grounddark navy· vertical stripescream· buttons- Overall silhouetteLong-sleeve, tailored dress shirt shown from the front, tucked at the waist and fitted through the torso and sleeves.
- 02

Product
Neatly folded long-sleeve dress shirt shown flat from above; white poplin with evenly spaced vertical navy stripes, point collar, button placket down center, single-button barrel cuff folded over the shirt face, and four visible cream buttons.
- Overall layoutShirt is folded flat with collar at top, button placket centered vertically, left sleeve folded across lower left front, and cuff visible over the body.
1 region
x 0.08 · y 0.04 · w 0.84 · h 0.92 (high) - CollarClassic point collar with visible collar stand; collar points rest over the chest area and inner collar shows the same vertical stripe pattern.
1 region
x 0.26 · y 0.04 · w 0.48 · h 0.18 (high) - Fabric patternWhite ground with regularly spaced thin vertical navy stripes composed of a pair of close parallel lines (double-line effect) running the length of the visible shirt face and sleeve.
1 region
x 0.14 · y 0.10 · w 0.72 · h 0.78 (high) - Button placket and buttonsCentered front placket with four visible round cream/off-white buttons sewn through; buttons are plain with visible stitch holes.
1 region
x 0.42 · y 0.18 · w 0.16 · h 0.64 (high) - Cuff styleFolded single-button barrel cuff visible on lower left front; cuff edge aligns with the vertical stripe pattern and has one visible button on the cuff and a second button on the placket extension.
1 region
x 0.08 · y 0.56 · w 0.28 · h 0.34 (high) - Label clusterTwo fabric labels sewn on the inside back of the collar area: a small dark rectangular label above a white square label.
1 region
x 0.40 · y 0.06 · w 0.20 · h 0.10 (high) - Brand label text“THOMAS MASON”
1 region
x 0.43 · y 0.10 · w 0.14 · h 0.04 (high) - Secondary label text“FABRICS / TISSUS”
1 region
x 0.43 · y 0.13 · w 0.14 · h 0.03 (high) - Top dark label partial text“31”Partial
1 region
x 0.36 · y 0.06 · w 0.28 · h 0.08 (medium) - Size/fit text block“15.5 39”Partial
1 region
x 0.46 · y 0.08 · w 0.10 · h 0.04 (medium)
Other
Studio flat-lay photo with neutral light gray background, even soft lighting and soft shadowing around the shirt edges; image is cropped closely to the shirt with top-down camera angle.
- Background and stagingShirt is photographed on a uniform light gray backdrop with no props; even diffuse lighting minimizes harsh shadows.
- ShadowingSoft vignette-style shadow visible beneath the shirt edges, most noticeable at the bottom edge.
1 region
x 0.18 · y 0.84 · w 0.64 · h 0.12 (medium) - Shot compositionTop-down centered crop showing full front face of the folded shirt; minimal negative space on left and right edges.
Colors
bright white· shirt bodynavy· vertical stripescream· buttons- Overall layoutShirt is folded flat with collar at top, button placket centered vertically, left sleeve folded across lower left front, and cuff visible over the body.
Variants
8 SKUs| SKU | Title | Price | Avail |
|---|---|---|---|
| 4765817 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 145 | CA$375.00 | Yes |
| 4765818 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 150 | CA$375.00 | Yes |
| 4765819 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 155 | CA$375.00 | Yes |
| 4765820 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 160 | CA$375.00 | Yes |
| 4765821 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 165 | CA$375.00 | Yes |
| 4765822 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 170 | CA$375.00 | Yes |
| 4765823 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 175 | CA$375.00 | Yes |
| 4765824 | Dual-Striped Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Patterned Blue - 180 | CA$375.00 | Yes |