OH please, just put it away. We're talking about that midriff which far too many women have taken to exposing to the elements of late.
The whole shrunken T-shirt/hipster-combats look has a certain cuteness if you are aged 16 with the body of Gwyneth Paltrow; otherwise, it implies a frantic pursuit of long-since lost youth and an embarrassing want of personal dignity. So just cover up that tummy (and while you're about it, get rid of that cliched navel ring).