What Should I Look for in a Bra Camisole?

I really want to get some new pieces for my wardrobe. I think I would like to get a bra camisole or two. Can anyone tell me what I should be looking for when I purchase these. Some of them look quite flimsy, so I definitely want to find one that is sturdy enough to wear on its own or as an undershirt. I don’t want anything see through, that is for sure. They are much more versatile if you can wear them alone or underneath something, and I try to get the most useful clothing items I can for my wardrobe.