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Boy Shorts

Modeled after men's briefs, they take on a more rectangular shape than most panties. While 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 ($14, originally $22)

The 7 Best Types of Underwear You Should Own

Like the air we breathe and the water we drink, underwear is a part of life so ubiquitous that it often goes unnoticed. Don't let another year pass being unclear about your underpinnings - especially considering 99 percent of you are wearing them right now. (And if not, well, maybe you should be.) Whether you're looking for something sexy or comfortable, we have you covered. Keep scrolling to shop our top picks.

- Additional Reporting by Kate Schweitzer

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I Bought This $14 Bra on Amazon, and I'm Never Wearing Anything Else Again