Small = 34 to 36 inch chest
Medium = 38 to 40 inch chest
Large = 42 to 44 inch chest
X-Large = 46 to 48 inch chest
XX-Large = 50 to 52 inch chest
Ladies Size 10
Ladies Size 12
Ladies Size 14
Ladies Size 16
3-4 years = 26 inch chest
5-6 years = 30 inch chest
7-8 years = 32 inch chest
9-11 years = 34 inch chest
12-13 years = 36 inch chest