You actually have a very good point here but I believe that it has to do with the location of someone's business that has such major influence on the kind of clothes that religion there is going to affect when you are dealing on clothing business.Well, gender neutrality in clothing industry, should not and it may not be the best idea. This is because their are some individuals religion which forbids the other gender in the used of other gender material or clothing. For that, it may affect their market.