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First and foremost, it should feel and look great. There is a noticeable difference when you slip into a well-fitted bra. You feel secure and supported.
Will finding the right bra mean all discomfort disappears as soon as you put it on? Not exactly. Just like a new pair of shoes, your new bra and you will need a few days to adjust to each other. But nothing should hurt or poke.
You will be aware that you are wearing a well-fitted bra. The band should feel snug but not tight. If you can't feel the band, it's not doing its job.
​The bra should remain in place when you raise your arms or lean over. Your breasts should not pop out of the cups when you move.