I have a couple of Bella Bands that I used during pregnancy to stay in my pre-preg trousers longer. Now they're useful for nursing: I just wear them under a regular shirt and they cover my side and stomach when I pull up the other shirt.
In terms of special nursing wear, I haven't had much luck. I bought 3 shirts from Motherwear and *hated* them - thumbs down - they are beyond frumpy and I feel stupid for buying so many.
I also have the Bravado nursing tank, which is very flattering and supportive, though a bit low-cut. What I don't like is that it's a drop-cup, exposing the entire boob, which is totally indiscreet and completely obviates the point of special nursing wear. Also the fastener is not easy to do and undo one-handed.
I think I'm giving up on the special nursing wear and will just stick with regular shirts and Bella Bands.