Please check the size chart as below:
Size Fit ages Chest Waist Shoulder to Hem
S 6-9monthes 28” 17” 21”
M 12-18monthes 20” 19” 24”
2 1-2years 22” 21” 26”
4 3-4years 24” 23” 30”
6 5-6years 26” 25” 33”
8 7-8years 28” 27” 37”
10 9-10years 30” 29” 39”
12 11-12years 32” 31” 41”
14 13-14years 34” 33” 43”
16 15-16years 36” 35” 45”