Let me tell you up front, I'm not suggesting that you start renting formal evening wear. I mean, if that's your thing and it's working for you, go right on ahead with it. I don't want to mess with your brand or your personal style.
What I have in mind is something a little different from that and has nothing to do with you not being you.
Over in St. Louis at the Sci-Fi Lounge, the owner is an artist so it only seems natural that he hosts Drawing Club for people to come in and get creative on the first Friday night of each month. To add to the creative sparking of folks coming in to participate, the head man provides models in costumes.
Whether you use friends or aspiring actors, a few extra warm bodies aren't that costly to have attend an event as it turns out. Just as a chorus of voices are sometimes used for audiobooks, recruit a couple of males and a couple of females (depending on the needs of your tome) to join you at your next signing event.
It's my understanding that there's a plethora of unemployed actors dying for exposure. All they need are properly marked copies of your text. Let them do the reading while you sign autographs or mingle. You can save your voice for the Q&A.
They don't even need to be in costume.
As a bonus, a video recording of the event can be uploaded to YouTube to provide a perpetual marketing tool for you and your book (as well as providing a little exposure for those helpful actors searching for fame). If you can work out a way to get some cats and babies doing something cute on-screen, you may get more views than you know what to do with.