oh my gosh i think breastfeeding tops are an absolute necessity! our local department store sells them so i have a bunch, but theres much nicer ones available online.
I wear one every day. In reality, it would be much the same to buy one of those "baby bands" (the ones u wear under normal shirts when pregnant so your not showing the bottom half of your belly) and just wear a normal top over, but a special breastfeeding top is so much less bulky and i think much easier, especially when your first starting out