I thought these were Chinese sizes ( I do get a lot of them off amazon) but be rest assured these are regular US sizes.  I generally take a size 16 in US womens or an XL, in Chinese sizing I'm generally a 3XL or 4XL, after looking at the size hart I fell between an XL and 2XL so I ordered the 2XL thinking it might be small.  but it was too big.  so you can really order your regular size.  Cute suit, i thought it had shorts under it but it is regular cut suit under the skirt.  I like the underwire on the inside cups.  I will be exchanging due it it being too large, but it nice quality and has adjustable straps,