Just like the structural integrity of a high rise depends on its beams and pillars, the foundation of a good wardrobe depends on the kind of lingerie you pick. Unlike a pair of boxers men can live in, bra sizes are not one-size-fits-all. It’s easy to be flummoxed by the jargon and to confuse it with definite integrals—Lord alone knows the difference between 34C and 32DD! So to avoid wardrobe mishaps and grade-school flashbacks, we decided to create a video guide that will teach you how to correctly measure your size. Watch and learn, people.