Unique Vintage Tunic or Swimsuit Top

Cute as heck and totally unique! Vintage ('60s?) top or swimsuit top in cool summery shades of aqua and lime MEASUREMENTS/SIZE APPROXIMATE: 36" bust 34" waist 38" hip I would ballpark it at about a 10, and the bra cups at about a D. Adjustable button shoulder straps Built-in bullet bra with hook & eye closure Back zip Side vents I got this at a vintage shop, so its intended purpose is unknown, but it looks like it might be a bathing suit top that's missing its bottoms. I've worn it as a top.