I'm going to a friend's fancy dress party, dresses as the BATMAN!
I'm not sure dressing up as the batman counts as cosplay, but this is simply a question on how to fill in the costume.
The costume is slightly too big for me, and, next to wearing clothes underneath, what is the best way to "fill in" the costume?
I don't want to wear clothes underneath as I don't want to die of heatstroke