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