82% matchOfficine Generale
Softer French take on minimal wardrobe tailoring
What changes: Artisanal Italian/French fabrics, less stretch-tech, smaller range
Brand profile
Theory
New York contemporary label owned by Fast Retailing, known for minimal stretch-wool tailoring, knitwear and workwear separates.
New York CityOrigin
UnisexFocus
Minimalist / ContemporaryStyle
$$$Price
22 brands like Theory like Officine Generale, Cos, Todd Snyder →
What to know about Theory
Built on stretch, not structure
The label started with stretch trousers in 1997, and its menswear still runs on stretch-wool tailoring meant to move rather than hold a rigid shape.
Named fabrics do the work
Theory develops proprietary materials — Good Wool, Good Linen, traceable cashmere — and builds muted-palette suits, knitwear and outerwear around them.
Fast Retailing owns it
Theory sits in Fast Retailing's Global Brands division with Uniqlo and GU, which underwrites several hundred stores and consistent fabric supply at a mid-to-high price.
How Theory fits
Overall fit
slightly small
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.
Tip: 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.
Medium confidence · based on 18 sources
By category
| Category | Runs | Shape | Size advice |
|---|---|---|---|
| Hoodies & sweatshirts | true to size | regular to slightly slim, not boxy | Take your usual size, or size up one if you plan to layer over a shirt. |
| Shirts & overshirts | slightly small | slim, tapered through the waist with a narrow armhole | Broader chests and bigger arms should size up, or look for the Sylvain in a fuller cut. |
| Trousers & pants | true to size | slim to slim-straight through the thigh | Order your measured waist — the stretch wool gives, but the seat and thigh are cut close. |
| Jackets | slightly small | slim, high armhole, narrow shoulder | Most people size up one from their usual jacket size, especially for outerwear worn over knitwear. |
| T-shirts & graphic tees | slightly small | slim, close to the body through chest and sleeve | Size up if you want a relaxed drape; the Precise and Essential tees fit snug. |
Directional fit consensus summarized from public sources with AI — a starting point, not a guarantee. Confirm with the product's own measurements before buying.
If you like Theory
See all 22 brands like Theory →82% match
78% matchCos
Architectural minimalism at a lower price
What changes: High-street pricing and fit, less wool-suiting depth
74% matchTodd Snyder
American classics reworked, warmer and more heritage
What changes: Vintage-inflected Americana rather than sleek modern minimalism
73% matchTiger of Sweden
Scandinavian slim suiting with the same pared-back palette
What changes: More overtly fashion-forward suiting, weaker knitwear/casual line
Theory fit questions
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.
Brand facts
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.
- Founded
- 1997
- Origin
- New York City, United States
- Made in
- China
- Price
- $$$
- Focus
- Unisex
- Facts checked
- August 2026
- Styles
- Minimalist / Contemporary, Quiet luxury, Urban prep / Ivy