These are Asian size which is usually one size smaller than USA or European size. A good rule of thumb is choose one size larger than your size so if you are a size med choose a size large if you want a tighter fit and choose a xl if you prefer a looser fit. also do go ahead and measure yourself and not this measurement is in cm.
Suggestion: Choose the size according to your weight.
Size S - Weight: 40 kg - 47.5 kg
Size M - Weight: 50 kg - 57.5 kg
Size L - Weight: 60 kg - 62.5kg
Size XL - Weight: 62.5 kg - 65 kg
Size Information
Size S Bust:76cm Waist:66-68cm Length:138cm
Size M Bust:80cm Waist:70-72cm Length:142cm
Size L Bust:84cm Waist:74-76cm Length:145cm