Vtg 80s 90s? Womens ILGWU Union Made 1 Piece‎ Swim Suit Size S/M Color Block

Vintage Union Made womens one piece swimsuit. There is no size tag. My mannequin usually fits a small best. There are some loose areas on the mannequin so I think it will fit more like a small/medium. No flaws, no padding, no underwire