Could use so help from the gals outthere?

Hey Everyone, me and hubby I have been married for 20 years, Two beautiful daughters are both away to college, so its just me and my dude. I love this man so much, but lately I have had the nag to kinda spice things up, as life for us has gotten to routine. We are going to dinner to celebrate our 21st wedding aniversery this upcoming tuesday. I want wear somthing that he has not seen me in. So I was thinking about wearing a tight pair of jeans or pants, and I connot beleive I am about to admit this, but I want to wear a thong for the first time for him, as I have declined sevearl time in this past. However I was trying to think of a way to reveal it to him through out our evening together. Kinda make the night a little slinky. Any Ideas, on how to make it look like an accident? Or make it exciting for him?