Should i keep my end of the deal?

A year ago we had a pre Christmas break first weekend of December. It was a package deal 2 nights (Friday and Saturday) in a hotel, bed breakfast and evening meal included with the Friday evening being a full Christmas dinner and party night. Long story short, upon our arrival and changing for dinner my wife discovered that packing in a hurry she had left all her underwear behind. She said that’s it we can’t go down to dinner, but after much persuasion by me she agreed to go and wore her shortish (mid thigh) dress as planned but with no knickers. After a few glasses of wine she relaxed and started to enjoy herself. We were both turned on by the experience and ended up having great sex that night. I told her I liked her with no underwear and she should stop wearing it permanently. She basically laughed and said not happening, but I convinced her not to buy any next day and try it for the whole weekend, we had a great weekend with loads of sex. I kept raising the subject of her giving up knickers and any form of trousers. We were in a beautiful hotel which she loved and kept saying I wish we could stay longer. So I told her if she gave up knickers and trousers for a whole year I would bring her back next year and we would stay the whole week my treat. She said she would try it for a week and get back to me, I figured she said that to shut me up. To my surprise she went for it for the whole week when we got home. Then she said she would make a deal, she would accept my deal on one condition. When we went away she would dress as a man and I was to be the woman in dresses and skirts for the whole week with no underwear. I didn’t think for a minute she would do this for a whole year so agreed, but she has. We booked our trip away several months ago and now she’s getting excited about me posing as her wife for the week, apparently it’s always been one of her fantasies. I don’t want to do this but she claims we had a deal and it’s happening, she is deadly serious and has told me we are going out at the weekend to buy me some outfits which she insists I WILL be trying on in the shop.