Properly fitted bra is the one with the band size tight enough to keep the bra in one place, however it has to be comfortable enough to move and sit with arms either held down or high up. Also it can't ride up in the back, which is caused by bra band being too loose and bra straps fastened too
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check out number 5 i have never found a bra that has that
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Common Bra Fitting Problems & Solutions, Part 2: Your Back Band – Bra Doctor's Blog
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