I was clearing out my room today and I have a Lolita vintage bathing suit made by Gabar from the 1960s. I've had it for ages but it's far too big for me under the arms etc. It is made out of seer sucker and the straps can be adjusted by a dolly button sewed on the inside. It is candy striped with a belt which ties into a bow it zips at the back and has a built in bra sewed into it, which can be easily removed. It also has little underpants which go underneath but they look quite large, If the suit fitted me I'd prefer to just wear regular bikini bottoms under it, you can wear anything under it as it covers that area. Although it isn;t bathing suit material, it can double as a dolly dress, top or bathing suit. I really love it but it's too much hassle to start altering it as it would lose it's cute shape. I guess the built in bra would be a B/C but like I said it can be removed. The waist can be altered thanks to the belt, without tightening it I guess It's about a 28 and the hips are free A line.
I bought it for $60 but I will consider any offers made.