At a pre-Grammy party, highly talented and highly lookable Nicole Scherzinger (dancer, singer, etc.) wore an outfit that was either somewhat transparent or translucent. And the lighting may have helped reveal what was underneath, which has happened to a few other women wearing black on top and nothing underneath.
In this case, it was clear that Nicole chose not to wear a brassiere. That was her choice, of course. The question is, did she know or did she not know what was visible? If she did know, then this is another case of breasts as fashion accessories, a previous subject of mine. If she didn't know, then we just get to contemplate the wardrobe malfunction, as the Daily Mail likes to refer to such incidents like this.