Retro Like Womans Polka Dot Swim Suit / Dress Plus Size 16?

I am unsure of exactly size but I wore this when I was a size 16/18 and it fit great. The tags has been cut out before I owned it. Still in great condition. No rips or tears. It appears there may have been another strap or tie you could attach to the back but it wasn't there when I purchased suit. 22" Length 14" waist