In the scene after Johnny's encounter with the surfer, he jumps off the Baxter Building and tries to flame up and fly. He fails, and after Sue touches him, she flames up. When Johnny tries to flame up, and becomes invisible, his clothes also become invisible. I thought that only Sue's uniform could do that and that his was only flame retardent. I know this because the reason why their uniforms can withstand their abilities is that they were affected by the storm while wearing these same uniforms!!!