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 (26-28), M (30-32), L (34-36), XL (38-40)

Belted Pants: (Minor-A & Major)

(waist sizes in parentheses) 

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

Adult: S (26-28), M (30-32), L (34-36), XL (38-40)

Hats: 

Youth (6 5/8 - 7 1/4)

Adult (6 7/8 - 7 1/2)

Socks: 

Tee-Ball (shoe < 3)

Youth (shoe 3-7)

Adult (shoe > 7)