Does a person's clothes can be a barometer for judging their religious beliefs? I don't think so.
Just read that a temple in Saurashtra has imposed a dress code wherein those wearing half pants, gowns and night dresses wouldn't be allowed to enter in the temple. The temple officials say this step is to maintain the Indian culture in the temple area.
Temples in Bali Indonesia too have a dress code. You need to be dressed in their 'formal' sarongs, wrapped around your legs and wear a temple scarf around your waist. These items are usually rented out at most temple entrances.
Is it really fair to restrict people on the basis of the what they are wearing. I don't think so.