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Theory
StyleMinimalist / ContemporaryQuiet luxuryUrban prep / Ivy
Known forTrousers & pantsTailoringSuits & blazers
Theory is a New York contemporary label founded in December 1997 by Andrew Rosen and Elie Tahari, initially a womenswear line built around stretch trousers, with menswear added in 1999. Japan's Fast Retailing holds it within its Global Brands division, alongside Uniqlo and GU. The collections center on minimal stretch-wool tailoring, knitwear, outerwear and workwear separates in muted palettes, using proprietary fabrics such as Good Wool, Good Linen and traceable cashmere. Theory runs several hundred stores worldwide and a Meatpacking District flagship.
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How Theory fits
| Category | Runs | Shape | Length | Size advice | Confidence |
|---|---|---|---|---|---|
| Hoodies & sweatshirts | true to size | regular to slightly slim, not boxy | regular | Take your usual size, or size up one if you plan to layer over a shirt. | low |
| Shirts & overshirts | slightly small | slim, tapered through the waist with a narrow armhole | regular; tuckable but not long | Broader chests and bigger arms should size up, or look for the Sylvain in a fuller cut. | medium |
| Trousers & pants | true to size | slim to slim-straight through the thigh | regular, often cut short enough to need little or no hemming | Order your measured waist — the stretch wool gives, but the seat and thigh are cut close. | medium |
| Jackets | slightly small | slim, high armhole, narrow shoulder | slightly short in the body, modern jacket length | Most people size up one from their usual jacket size, especially for outerwear worn over knitwear. | medium |
| T-shirts & graphic tees | slightly small | slim, close to the body through chest and sleeve | regular, hits at the belt | Size up if you want a relaxed drape; the Precise and Essential tees fit snug. | medium |
Does Theory run big or small?
Theory fits slightly small. If you're between sizes or broader through the chest and shoulders, size up — Theory's slim blocks run narrow, though the stretch fabrics buy some room. Shoppers generally describe Theory as cut slim and close to the body in a modern contemporary way, so many size up one, while slimmer builds often find their usual size true to size thanks to the stretch fabrics.
How does Theory fit?
Shoppers generally describe Theory as cut slim and close to the body in a modern contemporary way, so many size up one, while slimmer builds often find their usual size true to size thanks to the stretch fabrics. Overall shape: slim, narrow through the chest and shoulders with a contemporary tailored line.
How do Theory hoodies & sweatshirts fit?
Theory hoodies & sweatshirts fits true to size. Take your usual size, or size up one if you plan to layer over a shirt. Shape: regular to slightly slim, not boxy.
How do Theory shirts & overshirts fit?
Theory shirts & overshirts fits slightly small. Broader chests and bigger arms should size up, or look for the Sylvain in a fuller cut. Shape: slim, tapered through the waist with a narrow armhole.
How do Theory trousers & pants fit?
Theory trousers & pants fits true to size. Order your measured waist — the stretch wool gives, but the seat and thigh are cut close. Shape: slim to slim-straight through the thigh.
Directional fit consensus summarized from public sources with AI — a starting point, not a guarantee. Confirm with the product's own measurements before buying.
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