I found that this bra fitted the sizing guide well, fit perfectly and stopped bouncing. I was after something to hold me tightly for high impact exercise (running) and I've found this really helpful for that.
Great bounce control and a good bra to put on for those with shoulder issues with the front zip.
Why not remove the guesswork and make their bras match their sizing guide? the Bra fits, not a flattering cut or particularly comfy but it does stop jiggling. Helpful clip on the front to assist with getting it on however can still be a mission to line up the zipper.