drawstring
noun
- string or cord used to draw up or gather a length of material, or close an opening
Wiktionary
noun
Etymology: From draw + string.
- 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).