Trying to find a bra that fits you ~perfectly~ can be a disaster. View this photo on Instagram instagram.com / Via realitytvgifs.tumblr.com Even if you whip out a tape measure, things can go awry. Tap to play GIF Tap to play GIF Bubzbeauty / Via youtube.com But there's a trick to finding the best bra for your girls, and it's called sister sizes. Essentially, sister size bras have the same cup capacity even though they're different sizes. View this photo on Instagram instagram.com "By going down in the band size and up in the cup size, the cup capacity of the bra will remain the same," Christina Faraj Savarese, the Bra Fit Expert, tells BuzzFeed Life. You may actually fit into a sister size better than your ~measured~ size depending on the bra you're trying on and the shape of your ta-tas. View this photo on Instagram instagram.com "You can adjust your bra size and still get the same or similar fit. For example a sister size of 34C is 32D," Faraj says. Advertisement Bras, like all clothes, fit differently depending on style, cut, and brand. View this photo on Instagram instagram.com "You may be a 34C in a structured push-up bra, but a stretchy lace bra in 34C won't fit the same. In this case you would try a sister size, either 32D or 36B," says Faraj. Everyone has a sister size! Just adjust the band and straps to get the perfect fit. View this photo on Instagram instagram.com Use this handy chart to find your sister size the next time you're shopping: Alice Mongkongllite / Via BuzzFeed Life All of the cup sizes that are on the same horizontal line across the chart are sister sizes. And use these easy tips to adjust your brassiere accordingly. View this photo on Instagram instagram.com No go forth and wear your best bra! Tap to play GIF Tap to play GIF New Line Cinema / Via giphy.com Share On facebook Share On facebook Share On vk Share On vk Share On pinterest Share On pinterest Share On lineapp Share On lineapp Share On twitter Share On twitter Share On email Share On email Share On sms Share On sms Share On whatsapp Share On whatsapp Share On more Share On more Share On tumblr Share On tumblr Share On link Share On link Share On copy Share On copy Omg It's Prime Day!