Solution- you need to try a smaller back size, this will ensure your bra stays in position below the bust. You also need to consider the cup size, when you reduce your back size, you are reducing the whole width of the bra, so this means the width of the cups are reduced slightly. So if the cups on your bra fit well, it may be worth considering also going up a cup size, to give you the extra room in the cup that you are loosing by going down a back size. My advice is to try both the same cup size and the larger one, and see which is the best fit. (eg. if you are wearing a 44E and the back size is too big, try a 42E, and a 42F) Bra Size, Problem Solving Bra Size Guide
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