I am a certified bra fitter who worked at a lactation place for a year working with nothing but pregnant and nursing mothers. You definitely want to get something that is going to be in a range of sm, med, lg, xl (etc.) I would not recommended a underwire and if you get one while you are nursing it is very important that the entire breast fit inside of the cup so that you do not clog your ducts or anything.
As far as brands go, I LOVE the Bravado Silk Seamless for before/after. I think it's a very comfortable, flexible and supportive bra. You can look online for one. To measure have someone gt your measurement across the top of your chest (and around your back - this is your band size) then across the front of your breasts. Each inch over your band size equals a cup
I absolutely HATE Motherhood Maternity bras. For some reason they always have these painful wires in them - torture wires as I call them.
at 5:25 PM on Nov. 6, 2010