When trying to decide between two sizes, choose the larger size for a better fit.

SizeChestWaistHeight
Xsmall20-2220-2136-41
Small22-2421-2241-47
Medium26-2823-2452-55
Large30-3225-2657-61
Xlarge32-3426-2761-64
S/M22-2821-2441-55
L/XL30-3425-2757-64
Child OS 26-3223-2652-61