I empathise. I was huge & un-dignified when I went to John Lewis to get measured for nursing bars, though I bought my favourite one online from activebirth. Can't remember if it's .com or .co.uk. I'll be buying my next ones from there.

I didn't actualy buy maternity underwear as I bought some pants from mothercare & never, ever fitted into them. I just bought a couple oof multi-packs of cheap bikini style pants from Tesco's in a 14 (I was a 12) They fitted under the bump & were fab.