A string or cord, encased in a fabric tube, with one or more small openings into the tube, on a bag or garment, allowing the item to be closed (as with a bag) or tightened (as with sweatpants or a bathing suit)
A drawstring is a cord that goes through an opening, for example at the top of a bag or a pair of trousers. When the cord is pulled tighter, the opening gets smaller. a velvet bag with a drawstring. a string through the top of a bag, piece of clothing etc that you can pull to make it tighter