If you are anything like me, you have to try it on. I've seen some online that I've loved, but have no faith in picking one out that will look good... I mean, this is as close to naked-in-public as I'm ever gonna get!!!
I have found separates work best for me. I bought a couple pair of basic bottoms from Target (was lucky enough to find them on sale, clearance even) and then went on the hunt for tank-style tops that would work. I found one at Meijer and one at Macy's. The Meijer one was pretty cheap, and it's actually held up better than the expensive one from Macy's.
Sometimes for Macy's, you can hit a really great sale, the 20% off items that are already on sale, or $10 off $30 spent, whatnot.