In my opinion, either description of the most likely style is accurate. In the 1970's we had what was called a "two-piece suit" that was NOT a bikini. Most emphatically not. Good girls wore two-piece suits. Fast girls, including girls from California, wore bikinis. I'm just joking But there was a certain style that was more like a short set you could wear in the water or look good romping in the shallow waves, but wasn't really for swimming. It was more summer casual wear. I think this is a recent design based on retro styles, but it looks a lot like one I owned in 1973 or thereabouts. (click to enlarge) I've always wondered if this woman had been at a picnic or pool party, or at a motel with a pool, or something like that before she was killed.