I am in despair of ever finding a bra that is comfortable. I have always had biggish boobs and been a bit overweight, so big back size more than cups. Gradually gone up over the years from 36 B/C to 38C. I always it easy to find bras that fitted and were comfortable, usually good old M&S.
Then had 2 dcs within 2 years 
and breastfed them both, stopping 6m ago. I had incredibly tender/sensitive breasts all through this time and wore very soft nursing bras, mostly the seamless bravado brand - bliss. My shape has changed and I am more overweight, so have gone up to maybe 40 C/D. I've been measured twice in M&S who weren't that helpful, but said the 2 new bras I selected fitted well. But they are agony. They seem to ride up too high, can't decide if the cups are slightly too big or too small,and the underwires dig right into my armpits. I went back to M&S who said this was because cups were too big, but then said the cups fitted well??
I am so sore after a day at work that I am thinking of wearing the nursing bra tomorrow - but not the best support for now-droopy boobs. Anything with a slight shell would be useful as my nipples are twice the size they used to be since bf and tend to show through thin cups, but don't want padded as I don't want them to look any bigger!
Help, please, before I turn into a mad bra-less woman whose boobs will soon be round her knees...