Maternity/Nursing bra's?

Hey all! Just wondering if there is such a thing as a comfy maternity or nursing bra??? I've bought a couple- a set from boohoo, h&m, Costco (puma sports bras) but I either get the size wrong (too small) OR if they do fit - the clips where you unhook (so you can pop the boob out) are uncomrtable! I find myself scratching at them when I'm at work or wherever. My commies has been the large sized sports bras from costco but they won't be good for when Im breastfeeding..

Any advice would be appreciated!