The size guide library
Straight answers about how brands really fit: does it run small, when to size up, and how to convert between systems. New here? Start with the launch announcement.
Brand fit guides
Uniqlo
Tends to run small
Slim Japanese fit with shorter sleeves and torsos; most Western shoppers size up one.
View size guide →Levi's
True to size (stretch)
Modern stretch fits match your real waist; rigid and Shrink-to-Fit classics need sizing up.
View size guide →Adidas
Shoes tend to run big
Originals run about a half size large, so many size down. Apparel varies by line.
View size guide →Gap & Old Navy
Tend to run large
American vanity sizing at work: both cut generous, with Old Navy the roomier of the two.
View size guide →Shein
Tends to run small
Small-running and famously inconsistent. The garment measurements decide, not the label.
View size guide →Lululemon
Snug by design
Numeric sizing and compression fits, so sizing up costs you the compression.
View size guide →Mango
Tends to run small
A slim European block in the Zara family; many US shoppers go up a size.
View size guide →ASOS
True to size (own brand)
ASOS DESIGN fits true on a UK block, but the 850+ brands it stocks each fit their own way.
View size guide →Nike
Runs ~half a size small
Footwear runs about half a size small and apparel cuts athletic-slim. Charts and tips inside.
View size guide →Zara
Runs small / slim cut
A slim European cut that has most shoppers sizing up. US/UK/EU charts and denim tips inside.
View size guide →H&M
True to size
Generally true to size with a standard European fit, but watch the Divided line. Full charts inside.
View size guide →Reference guides
International Size Conversion
Master reference
The US ↔ UK ↔ EU ↔ AU ↔ JP conversion charts for clothing and shoes, in one place.
Open the reference →Bra Size Guide
Band, cup & sister sizes
How band and cup sizing actually works, with a worked example and US/UK/EU differences.
Open the reference →Jeans Inseam & Length
Inseam by height
Typical inseams by height, petite/regular/tall explained, and how to measure your own.
Open the reference →Or skip the charts entirely.
Attirel knows how every brand runs and matches sizes to your measurements automatically.
Try Attirel at attirel.ai →