Im a size 12 in pants and 38D bra. This swimsuit fits perfectly in XL so its not really plus size but is obviously adjustable. The XL top would not cover much more than my D cup though.  I have several of this brand in different colors and when I was wearing 14/16 pants and 38/40 DD top the XXL fit perfectly with plenty of room to adjust coverage on the bottoms to fit if you are larger than 14/16.