size 16 for 2-3 years chest 24"
size 18 for 3-4 years chest 26"
size 20 for 4-5 years chest 28"
size 22 for 6-7 years chest 30"
size 24 for 8-9 years chest 32"
size 26 for 10-11 years chest 34"
size 28 for 12-13 years chest 36"