Shirts:

Youth: S (6-8), M (10-12), L (14-16)  (youth shirt sizes)

Adult: S (34-36), M (38-40), L (42-44), XL (46-48), XXL (48-50)  (chest sizes)

Elastic Pants: (Tee-Ball, Minor-C, Minor-B)

(waist sizes in parentheses) 

Youth: XS (20), S (20-22), M (24-26), L (28-30), XL (32-34) 

Adult: S (28-30), M (32-34), L (36-38), XL (40-42)

Belted Pants: (Minor-A & Major)

(waist sizes in parentheses) 

Youth: S (20-22), M (24-26), L (28-30), XL (32-34) 

Adult: S (28-30), M (32-34), L (36-38), XL (40-42)

Hats: 

Youth (6 1/4 - 6 7/8)

Adult (No dimensions given)

Belts: (Minor-A & Major)

Youth (Up to 28")

Adult (Above 26")

Socks: 

Tee-Ball (4-7)

Youth (8-11)

Adult (9-15)