Nursing Tops for Summer

Hi, I am nearing the end of my pregnancy (35 weeks now) and I want to stock up on some nursing tops. I bought 2 nursing bras yesterday. I want tops that I can breastfeed in in public this summer without exposing my tummy. It gets hot here but most places do not have A.C. Plus I am a nanny and I will be bringing my baby to work with me so I want to be able to easily feed when I bring the big kids (8yo and 6 yo) to the park or library or museum. What do you all recommend?