Sizes are as follows:

Size 2 - 1yr to 2yr

Size 4 - 2yr to 4yr

Size 6 - 4yr to 6yr

Cheongsam measurements

size  | Length(cm)  | Chest(cm)
2          54                56     
4          57                60     
6          62                62

Material is brocade, still thin enough to wear in Singapore.