Hi, it doesn’t matter what cup size u r going up to for the macom one. U just order the back size u r now & it just seems to stretch cuz it’s a surgical compression bra.. They r a little more expensive than others, think they work out about £33. But they were worth it for me, I had an uplift & BA & it is so comfy with no seams & front fastening. If u put MYBREAST as a promotional code u get 15% off. Iv seen a few ppl saying they bought loads & lived in their macom 1. Good Luck, hope all goes well. xx