Insanity, I think it is wrong to conclude who or what a person is by what the person wears. The saying "don't judge a book by its cover" comes to mind.
I truly believe we must give people the chance to show who or what they are by interacting with them.

And to show why modest dress has been prescribed by the creator...well, that implies that everybody believes in the same faith, or generally has faith in a creator. That just is not the case, therefore presumptious and will foster resentment.