So she goes on wearing quarter cup bras but of course the nipples are very visible under her clothes and the constant rubbing against the clothes stimulates them. Before pregnancy a bra somehow pushed her nipples back into her breasts but this has become impossible.
They've also stopped being sore but they remain tender so that bras still feel uncomfortable. They are longer than they used to be (about 3/4'') and though they've stopped being hard all the time they stay more or less erect and get completely hard easily. So, what I was going to say was that after breastfeeding her nipples lost some of their volume but they never regained their previous shape.