Measure your waist around the slimmest part of your waist and your hip around the widest part of your hip. Measurements are given in inches. Kids who wear size 14 / XL will fit into an adult size XS if youth XL is unavailable. Similarly, youth 16 / XXL fits like an adult size Small.

Size Hip (in) Waist (in) Youth Size
YXXS 22 - 24.5 20.5 - 22 3/4
YXS 24.5 - 26 20.5 - 22 5/6
YS 26 - 28 22 - 23.5 7
YM 28 - 30 23.5 - 25 8/10
YL 30 - 32 25 - 26 12
YXL 32 - 34 26 - 27.5 14
Y2X 34 - 36 27.5 - 29 16