I don't want to paint with too broad a brush and there are always exceptions, but unfortunately common sense dictates that it will be more difficult to alter her views, the older you both are and the longer you've been married. If she has any religious or moral objections it will be even more difficult to have her change her mind.
A 30ish year old woman in a fairly new marriage will be more flexible than a 60 something woman who has been married to you for 40 years and who has never imagined that you enjoyed wearing women's clothing. I'm sorry.
That said, there are people who are open minded no matter their age. But unfortunately your wife is telling you that she isn't.
The best you can do is to ask her to stretch enough to begin to understand that the CDing is not a sickness or a sin. Find some resources that she can read. You can then tell her that you understand her disapproval, or her reluctance to participate, but try to impress upon her that you simply need to express this part of yourself that you have suppressed for most of your life. Let her know it is not sexual. Again, the resources you find should help her to understand this.
And then, let her know that you do not want to force her to participate, but you also do not want to lie to her and dress behind her back. Ask her to negotiate times with you where you will be free to express yourself. Be sure to let her know that she is ALWAYS invited to join you, since you do not want her to feel as if you are trying to keep her out of it.
You might want to find a gender support group to join. Most of these groups welcome the wives. If your wife is deadset against the CDing, she might feel more comfortable if you attend a support group rather than begin going to gay bars dressed, for example.
Good luck!
