yeah, thanks for explaining. it helps a lot.
i talked to one guy (on the internet) who said he liked cross-dressing. i found it interesting to talk to him...

he said that he was straight. wasn't attracted to guys. for him... he said when he was a boy he remembers watching his mother dress up to go out and he was really fascinated with watching her do her make-up and hair and put on her perfume and stuff like that. he said that he found her clothes comforting. comforting. that was the way he put it. that sometimes when she wasn't around he would take items of her clothing from the laundry hamper because they smelled like her and because he found them comforting. he said it wasn't anything sexual. it was just comforting. maybe... from what you have said... it might be a similar thing for your husband? it might be... that he doesn't really want to talk about it because he doesn't think that it will change anything between you? maybe he envisages continuing with being discrete about it. i guess if he did find it erotic now would be the time for him to tell you (incase you felt similarly so that could be incorporated into your sexual activities). but maybe... it is about comfort rather than sex.

could you talk to him about it a little? maybe ask if it is about that? i agree that i wouldn't really know what to make of it / how to feel about it until i understood something of why and what it was doing for them.