I need a pregnant superhero costume for Comic-Con!

I usually go to Comic-Con with a group of friends, most of which are special needs, and we all dress up with a set theme. This year's theme is Superhero. I planned on being Catwoman until I found out I was prego. I'll be 6 monthsby the time we go and should have a decent sized belly by then so the leather, skin tight outfit I originally thought of wearing is out the window. What should I do? who should I be? I need some creative ideas please!