Hi Bobbi,
Kerry hit it on the head when she asked how your wife found out, and if it was something you discussed prior to marriage. If it wasn't, then as Kerry said, your wife is likely more upset about the lack of honesty than your dressing.
For most if not all of us, the fact we either want to be a woman, or want to present ourselves occasionally as a woman is the most embarrassing conversation we likely will ever have. There is no easy way to approach the subject, and anyone not experiencing those feelings themselves is going to have a very hard time understanding why we feel this motivation. Your wife married a man and most likely only wants to envision you that way. Remember if you were ever caught, it would be an embarrassing situation for her to face as well. The other factor is whether you have any children who could find you dressed, or any friends, family members, etc. who have a key and could surprise you and find you dressed.
All that being said, before you talk to your wife again, sit sown and honestly write down what you perceive as your motivation. Many of us suppress either being Transgender and perceiving ourselves through clothing as the woman we want to be, or wanting to be with a man sexually, or just the sexual gratification wearing soft things can bring on. Examine what your own motivation is and how important whatever the reasons are to continue. Do you want to take it further, be fully dressed with smooth skin, wig, makeup, etc, go out dressed to be with others, go fulltime as a woman, or can you be satisfied with the occasional dressing in your own home. Be honest with yourself, a semi truth told to your wife now, will only make matters worse if she discovers more later on.
Once you understand yourself, as Kerry suggested, sit down with a bottle of wine, maybe even go away for the weekend if you can, and read what you wrote to your wife. Remember, there is NO way another who doesn't have these feelings can truly understand the depths of our feelings about this. It's our job tyo try and help them understand.
Good luck and let us know how you make out.