Most men who crossdress are heterosexual. If it bothers you talk to him about it and decide what you two can accept. If you don't want him wearing your panties, lingerie, etc would it be okay if he only wore his own collection of bras, lingerie panties, etc? Maybe you two can go lingerie shopping together. As to the why, he probably just enjoys how they feel. He probably isn't wanting to become a girl he is most likely just enjoying the girly feeling of wearing lingerie. He may also like that the lingerie belongs to you. Talk to your husband and remember that a lot of men do this and it only means that he likes lingerie, nothing else.
