Among all the things you and your wife have in common, Chrissy, you now have a shared confusion regarding crossdressing. For you the confusion exists around your need to find some time, place, and acceptance for your crossdressing. Your wife's confusion exists around the more emotional, psychological, and relational aspects of crossdressing. I won't get into defining those, there are several excellent books available and articles on this forum.
You two have a common need to resolve the shared confusion. This can be a good starting point for discussions. Be humble. Explain that you are having trouble coming to grips with crossdressing and in your confusion you disclosed it in a tactless fashion. Tell her that you acknowledge that it hurt her deeply and you want begin to make it right. Let her know that you expect her to be confused, perhaps angry, and to have other strong feelings that you may not be able to comprehend without her help. Ask her to guide you to understand her feelings as you explain yours. Provide some material or web links. Admit that it is a lot to take in all at once and you don't expect her to grasp overnight what you've had decades to understand.
This talk should not be an attempt for acceptance. I believe that the best you can expect is to set a date when you two will discuss this again.
Regarding my disclosure: I sat down next to my wife and reminded her of how we have always been truthful with each other. I never want to keep secrets from her. She needs to know that I am struggling with a strong desire to wear feminine clothing. I said that I don't fully understand it myself and I don't expect her to understand.
It did not go well. After a couple of really tense days during which she did some independent research, she came to me and acknowledged that it is something I will have forever and she cannot change me. She remains quite saddened by it all; it affects her feelings of self worth. I feel lousy for being the source of her unhappiness.
Due to a great deal of pressure at her work, we agreed to resume talking about this in the spring, after the work pressure is relieved.
Best wishes
MsVal