wow, thats the one i see for the first time, Sandee is awesome
Slingsuits (and similar designs) are really the suits for women with hourglass figures, the more extreme the better. It's not just the breasts it highlights (although it can be the, slang, "tit-fucker's paradise," as I've said before), but the high, "over the hip" connection can really show off that curve from any angle.
Sandee has an extreme hourglass, and slender at that, so a slingsuit (or similar design) just fits her tight, but curvy figure like a glove.