Chubby cosplayers can also just choose to own it. Last year at SDCC, my friends and I all wanted to go as the "Fat JLA" because we all love those characters and we're all fat. Unfortunately only myself and another buddy got tickets. So we rolled out some spandex and went as fat booster and fat beetle. And we had an amazing time. Nobody took our pictures, and none of the attendees liked our costumes. But you know who did? Dan Jurgens and Norm Rapmund. It's about love and enthusiasm for comics.
Oh man, there is not enough Booster and Beetles out there to begin with. I would have given you the highest of fives, and goofed around with you two.