What caused her to make this decision if you both loved it?
Thank you for that additional info. When did she say stop? How old are the children? You say that you "assume" does this mean that you've never asked why? Was there ever a discussion or how did she let you know she wanted you to stop?
It's imperative that you let her know that this was never a game for you, but something that was a part of your life. That even after all of this time, it's still something that is very much a part of you. A part that you don't want to let go. I can, in a sense, see where she is coming from. Children are so unpredictable that you never know when they are going to pop up, and they always tend to do so at the most inopportune moment.
The only time she might feel completely safe about it would be if the children were not in the house at all. It might be time to consider a babysitter, either outside the home, or you have one in the home while your wife and you go to a hotel. Going to a hotel could add a new element of excitement and sensuality to your relationship. You could meet separately, or even at a bar, pretending as if you just met. If you can get an outside babysitter, you could play and dress knowing that the children wouldn't walk in and it could make her a lot more comfortable and accepting of it. This is something you can plan on doing once or twice a month. Even if it's once a month, you can do different things each time and the excitement might be enough to hold you over until the next 'date'. I welcome your thoughts, let me know what you think.