Before she moves on to her Vegas gig, Britney Spears is touring the rest of the world to remind everybody that she's back in the game and ready to be seen, if not heard. So, why not head out of your hotel pretty much without a shirt on to drum up some interest. It can't hurt, it can only help, and speaking for myself, I'm feeling pretty helped.
Britney has talked recently about not wanting to be too sexy in her public image being that she's a mom and mature and all that now. But, there's no getting away from what sells tickets, and it's not Brit in sweatpants shopping at Target. She still looks quite amazing glammed up and showing off. I'd stick with that until it no longer works. Enjoy.