I bought this bra during pregnancy. Before pregnancy I had 75C in pregnancy then 80 D. Therefore, I bought L. But I'm not sure if a larger size would not have been better, because sometimes pushes the seams under the armpit. The seam forward, which was criticized in the review of MS1980 has not bothered me, but I also use breast pads. For the night I find this bra useless because my chest sideways falling out if I'm on the side.
For breast-feeding, the breast can simply take out the bra and is otherwise fine too. Again, I would buy the bra, however, because normal bras this or similar form are just as well suited for breastfeeding and are considerably cheaper.