Even if she knows about it, what is the point of dressing in front of her? She knows about it. Fine. You've been honest about it. Don't rub her nose in it.
How many of us would accept our wives or girlfriends dressing like a lesbian, or a man? What would be your reaction if your wife got a mans haircut, and let her leg and underarm hair grow out?
The problem with crossdressing, is that it gradually escalates. I've CDed all my life. You start out wearing a few items of cloths now and then. That works for a while. Then you decide to shave your legs. That's OK for a while, but you don't feel complete. So you shave from head to toe. Then you paint your toenails. Then you start wearing womens clothes around the house as much as possible. And what your wife or SO initially accepted, has escalated far beyond what it started out as.
There are no easy answers here. And it can be a burden to carry around all your life. So is blindness or deafness. Deal with it. There are worse problems you could have.
I think another mistake we make is to have this coming out, and serious discussion with the wife, or SO. You immediately give her the impression that this is a major part of your life and maybe more important than she is. I think it is much better, if you do get caught, to just downplay it, and say something like, "Yes, I dabble in it from time to time, but it isn't a big deal". "I'm just a little curious about it". And let it go at that, and see what happens.
