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1. The strap around your body should be firm but comfortable. When you stand side-on at a mirror, the strap that runs around your body should be horizontal and should not ride up at the back at all.
2. The wires at the front should lie flat against your rib cage and should not dig in, rub or poke out at the front.
3. Your breasts should be enclosed in the cups and you should have a smooth line where the fabric at the top of the cup ends and meets your bust. You shouldn’t have any ridge or bulging over the top or sides of the cups, even if you are wearing a balconette style or lower cut shape.
When you are trying on a bra, it’s best to start off by fastening it on its loosest hook. That way you will be able to tighten the bra if it starts to give in the back a bit when you’ve worn it a few times. Also, remember to adjust the shoulder straps to ensure that they are not too loose and you may need to adjust your breasts to make sure they are in the cups properly. It’s a good idea to try a T-shirt or top over the bra that you are trying, so you can see the shape that the style gives you underneath your clothes.