3T (3-4 years old) Waist 44cm stretch up to 58cm; crotch deep 14cm.5T (5-6 years old) Waist 48cm stretch up to 62cm; crotch deep 15cm.7T (7-8 years old)， Waist 52cm， stretching up to 66cm; crotch deep 16cm.9T (9-10 years old) Waist 56cm stretch up to 70cm， crotch deep 17cm.11T (11-12 years old) Waist 59cm stretch up to 73cm， crotch deep 18cm.