This is called 'crossdressing' and as fetishes and deviations go it's one of the more common, not to mention less objectional sexual deviations.
If you have a successful marriage in all other ways and he is loving, kind and caring try to reach inside yourself and find some loving sympathy and kindness,.....you might even develop some understanding. The majority of married people feel that their sexlives are their own private matters and keep them inside the bedroom (figuritvely if not physically!)........Try to look at it this way;...at least he's not into bondage or whips and pain, or worse!
By all means seek help from a therapist or psychologist, but, while that's happening, why not talk things over with him and see if you can both work at bringing things together yourselves. Why not have a weekly 'session' for him to fullfill his needs, on the strict understanding that there will also be a similar session another day for you to make love and have sex the way YOU want to too........
..........In this way you can help him, understand him and hopefully draw your sexual characters together eventually.