Standardizing Bra Sizing: Our Mission

Most women have been measured wrong at least once — and the reason isn't guesswork, it's method. For decades, the standard way to find a bra size in the US has been the "plus 4" method: measure your underbust, add four inches, and call that your band size. It's fast, it's simple, and it's the reason so many people end up in a band that's too loose and a cup that doesn't actually hold them.

BRABAR was built on a different approach: the rib cage method. Instead of adding inches, you measure the band directly under the bust — no padding, no guessing, no arbitrary math. The number you get is the number you wear. Cup size is then calculated from the real difference between that band measurement and the fullest part of the bust.

Why does this matter beyond one bra brand? Because the "plus 4" method was never based on anatomy — it was a shortcut adopted decades ago and never seriously revisited, even as bodies, sizing needs, and expectations changed. It systematically pushes people toward bands that are too big, which is exactly why support ends up living in the straps instead of the band, and why so many people believe they're a cup size they're not.

Our mission is to make the rib cage method the standard — not just for BRABAR, but for how the whole industry thinks about fit. That means designing for the sizes the plus-4 method leaves out entirely, like the 28 and 30 bands paired with fuller cups, and it means being loud about the actual math behind a correct fit, not just selling more bras.

Every size chart, every fit guide, and every product we make starts from this same standard: band first, cup second, and no shortcuts in between.