[ Fashion & Accessories ] Open Question : How come Yesstyle.com(asian fashon site) swimsuits only come in one size!!!! Help with conversion?

How do they expect these one size suits to fit everybody?! Like this fo example:http://www.yesstyle.com/en/cookie-7-set-stitch-hem-halter-bikini-miniskirt-black-one-size/info.html/pid.1020312679 I lovee thier bathing suits cuz they aim towards asian body types with they ruffles and bra type style which is good for ppl like me with small boobies but wth..they only provide one size and expect everyone to fit into it?! I don't even understand the conversion chart: http://www.yesstyle.com/en/help/section.html/hsi.795#1649 Can someone help me convert? I'm a 32A bust...generally wear a size 5/6 in panties...i waear a XS/S in shirts....size 1/3 in pants. Or...can you suggest a store in the USA that supplies swimsuits similar to the ones on this site with ruffled toss and demibra styles?