off-shoulder bikini
A specific type of shoulder-less bikini designed with a wide low-cut neckline (much like regular off shoulder garments), leaving the shoulders and upper chest area bare. Usually, it is a bikini with sleeves that sit on the arms instead of the shoulders.
Serika's official swimsuit is one of the best examples of this tag (ie. post #5464108, post #5446481, and post #5414592).
Other good examples include post #2911992, post #3186619, post #3560145, post #3781089, post #4080807, etc.
Regular bikinis that have their strap slipped off (ie. post #4709241, post #4662556, etc.) do not count for this tag. For one-piece swimsuits, see off-shoulder one-piece swimsuit.
See also
This tag implicates bikini and off_shoulder (learn more).