I adored my MayaWrap - my hands-down #1 favorite parenting tool.  It's a long loop of unstructured, lightweight cotton that can be worn and used so many different ways, and it's so much more comfortable than padded slings.  I've never breastfed myself, but I've seen women use it for this and nobody can see a thing.  Slips on and off in a second for those who don't like being tied into the more complicated slings, and you can put a sleeping child straight into his crib without removing him.