Oct 07, 2020 · Sister Size Up For instance your bra size is 34C, your sister size up will be 36B (One band size higher and one cup size smaller).What are bra sizes?In most countries, bras come in a band and cup size, such as 34C; 34 is the chest band, or the measurement around the torso directly underneath the breasts, and C is the cup size, which refers to the volume of the breasts. Most bras are offered in 36 sizes; the Triumph "Doreen" comes in 67 sizes, bra sister sizesSee all results for this questionWhat Are Sister Bra Sizes? - Bra Sizing Advice bra sister sizes23 rows · May 28, 2020 · Sister bra sizes are the sizes that surround your bra size. With the size of bras bra sister sizesCurrent Bra Size Sister Size Down Sister Size Up 36AA 34A 38AAA 36A 34B 38AA 36B 34C 38A See all 23 rows on www.amplebosom bra sister sizes