I know you came here for help to hide your tracks, but I just want to say how sad this is on many levels.
Sad for you because you can't express yourself.
Sad for your wife because she'll sense that something was up, if not now then in the future, even if she senses your unhappiness over not being able to dress. But she won't know what it is. If anything, she'll think it's another woman.
Sad for you both because now you might look forward to your wife leaving again, and she'll sense that too.
And the rift widens.
So after a period of time with the two of you becoming more and more distant over all of the unspoken "stuff", you may finally reach a point where you need to tell her because you won't be able to suppress it any longer, or she'll find your ever growing stash. And then it will be even harder to negotiate, since the marriage will have become distant.
Maybe I'm extrapolating too far in your case, but it's not an unfamiliar scenario around here. Sorry, I didn't mean to burst your bubble, but I just had to say it.
I'm glad you got to express yourself so much this month though.