It's great that your wife is so accepting to the level that she is. My wife is very accepting too... to the point of not going out dressed. So, I'm free to express as I would like so long as the daughter and granddaughters are not at home. She has seen me dressed enough now that it isn't very awkward for either one of us. In fact, it is generally accepted as the clothes I wear around the house. So for me, when I hear that little phrase, you could probably wear this out, I do my woohoo happy dance on the inside because it's one more step gained in her acceptance and comfort with that expression.
One thing to keep in mind when we get those little words of acceptance, acceptance doesn't always equate to participation.