Modeled after men's briefs, they take on a more rectangular shape than most panties. Similar to the hipster, the key difference is that they have a lower-cut leg. In fact, some styles' legs extend a short way down the thigh.
When to wear them: When fitted properly and made from the right fabric, boy shorts can actually serve the same function as a thong in being worn under formfitting clothes without visible panty lines. Longer cotton boy shorts, however, can even be worn as loungewear or pajamas.
Calvin Klein Modern Boyshorts ($22)