They're a modest solution for parents who don't want their young daughters to wear revealing two-pieces; and they're suitable for grown women who like the convenience of a two-piece suit with almost the full coverage of a one-piece.
I would say my absolute favorite would be the one-piece, either with a splice in the chest that dips all the way down, showing the belly button, or with a chunk of fabric missing in the middle, again revealing the belly button.
Album covers like Wild Texas Wind show Dolly in daring lingerie, but we can see that she's not much of a beach girl: the Internet is strangely bare of any photographs of Dolly Parton in a two-piece or one-piece swimsuit.
Instead, it's wise to focus more on how you feel about yourself, maintaining a balanced and healthy lifestyle instead of being anxious over how you look in a bathing suit, whether it's a one-piece or a skimpy two-piece.
And of course, the famous photo of star Betty Grable in a one-piece, looking over her shoulder, was the number-one pin-up during the war and labeled by Life magazine as one of the "100 Photos That Changed the World."