Sizing Guide

Baby Bodysuits (Onesies)
3-6 months 6-12 months 12-18 months
Weight (lbs.)
7-15 16-22 23-27
Chest (inches)
8.5 9.5 10.5
Length (inches)
11 13 14

All the Baby sizes are pretty accurate (i.e. 6-12 Months will fit a baby of that age range) and if anything they run a little roomy… which is good, because they’ll grow into them and allow for a teeny bit of shrinkage.

Women’s American Apparel Sizing Guide

S M L XL
Size US 0-2 4-6 8-10 12-14
Chest (inches) 30-32 32-34 36-38 40-42
Waist (inches) 25-26 27-28 30-32 33-35
Size Euro 32-34 36-38 40-42 44-46
Size UK 8-10 10-12 12-14 14-16
Chest (cm) 76-81 81-86 91-97 102-107
Waist (cm) 64-66 69-71 76-81 84-89

Real life example? All girl models are wearing Mediums in the Women’s Scoop Tees, and Boatneck Tees with 3/4 sleeve (even though I’m way more of a size 8-10, so it depends on what you’re comfortable wearing). However, I usually opt for a Large in the Classic Girl Tees, because they run small. In general it’s good to note that all American Apparel Tees run fairly fitted.

Men’s American Apparel Sizing Guide

S M L XL
Chest (inches)
34-36
38-40
42-44
46-48
Waist (inches)
30-32
32-33
33-34
36-38
Chest (cm) 86-91 97-102 107-112 117-122
Waist (cm) 76-81 81-84 84-86 91-97

Real life example? My models, Sean & Grant, wear Mediums.

Please let us know if you have further sizing questions or feedback!