To provide a sheet moving forward by skin movements of the human body for solving such problems that once an underwear slips off, the underwear stays on the position and cannot return to an original right position in conventional preventive technique of slippage of position of an underwear.

This sheet is stuck to the inside of an underwear. The sheet is used through attaching to the underwear, and can return to an original position by force of the sheet itself when the position of the sheet slips with external pressure to the underwear. The underwear can return to the right position by return of the sheet to the right position. The sheet needs energy to return to the right position and uses as the energy skin surface movements of the human body. As a snake moves forward by energy of movements of itself and the projections of snake scales, projections like snake scales are attached to the sheet, the energy of skin surface movements of the human body is changed into energy by which the sheet moves forward, and the projections of the sheet are hung to the wrinkles of the skin surface of the human body so that the sheet can move forward on the skin surface of the human body whenever the skin surface of the human body moves.