I've just had one on Saturday and I'm over 35 weeks pregnant. .. I got a nice maternity dress from new look and just wore a little blazer with it
I will be 34 weeks pregnant and am in uk so we already have heavy rain and winter weather
Mammalicious does some lovely dresses, go onto asos.com. depends how far along you are and what zoo. In the SW we have been having gorgeous hot weather of late (gorgeous that is if your not massively pregnant and can't fit into anything summery)
Maybe a sweater dress with leggings?