I didn't know why I'd need nursing tanks so much until I had my baby and started breastfeeding. Yes, you can wear them on their own, but the real key is wearing them under your normal tops when breastfeeding. Just pull up your outer top, unhook the straps on the tank, and boom — now you can wear your old tops instead of investing in all new shirts for nursing. The Simply Sublime Maternity & Nursing Tank ($45) gets points for its stretchy, supportive fabric and smoothing silhouette.