Ali dresses up for Roberto because she wants to please him and surprise him since he is all about pleasing and surprising her. As an athlete, everyday on this show is game day to Roberto. He is not so much about entertaining the guys, but saves his energy for entertaining Ali. It is all about her.Originally Posted by wannawin2nite;4012313;
Chris is more of a guys' guy. He jokes for the camera and performs in the PIs, but he is the most under-dressed and depressing when he is around Ali. She said that he makes her laugh, but we never see that. When she is with him, she has to dress down to his level otherwise it would look even more awkward than it actually appears and why waste all that effort on someone who wouldn't appreciate it.