I've been wondering if that wasn't the case for me. My exgf knew about my dressing. She and my wife were talking to one another before and after we broke up.
The reason I think this happened is my wife was never gonna know my secret but for some reason she started wanting me to put her bra on I protested at first but she kept asking me to put it on. So one weekend I said to hell with it and went upstairs with out her knowing and put it on then put my shirt back on and went downstairs to see if she could tell we sat next to each other for an hour and she still didn't say anything. So I told her I had it on and she wanted to see so I showed her. I used that to work my way into dressing even more and she's cool with it to this day.