Skirt or sirwal lengths:

2 years: 45 cm / 17.8 inches
3 years: 50 cm / 19.7 inches
4 years: 55 cm / 21.6 inches
5 years: 58 cm / 22.8 inches
6 years: 62 cm / 24.4 inches
7 years: 65 cm / 25.6 inches
8 years: 70 cm / 27.5 inches
9 years: 75 cm / 29.5 inches
10 years: 80 cm / 31.5 inches
11 years: 84 cm / 33.1 inches
12 years: 86 cm / 33.9 inches