Reference Size:
S: height=153-160cm weight=38kg-43kg bra size=70AB 75AB 80A waist: below 26 inch
M: height=155-165cm weight=43kg-50kg bra size=70C 75ABB 80AB waist:26-28inch
L: height=158-170cm weight=49kg-55kg bra size=75C 80AB 85A waist:29-31inch
XL: Height 160-170cm  weight 55-62kg, bra 80BC 85AB waist 30-32 inch
If not sure, can provide your bra size and waist measurement, will help in suggest the size :)