Following the bra question: I'm a 12G, and also struggle to find one that fits, let alone allows me to run. I was using 2 sports bras, one on top of the other. Part if my problem is that to get any kind if support it needs to be quite firm around my ribs, and that in turn limits my breathing. :/
Pholi I was exactly the same as you! I used a sports bra and 2 compression singlets (1 was always quite tight too) when I used to exercise before it found the panache! Quite honestly that 1 bra eliminates the need for anything else! I do tend to use 1 compression singlet though more for the tummy fat though lol. When fitted properly at least, if you do want to buy one id strongly suggest finding a supplier from their website and getting it fitted before buying, as when it's the right fit it really is amazingly!