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

SizeChestWaistHipsInseamHeightWeight
Small (4-6)26''23''27''20''39''-48''36-45 lbs.
Medium (8-10)29''26''30.5''23''49-53''56-70 lbs.
Large (12-14)32''28''33''26.5''56-60''88-112 lbs.
X-Large (14-16)33''29''34.5''28''60-62''112-134 lbs.
Boys Costume Sizing Chart Diagram