Drawstring Pajama Pants

drawstring
A string in the seam of the material of a garment or a bag, which can be pulled to tighten or close it
A drawstring (or draw string or draw-string) is a , , or rope used (when pulled) to "" (tighten) or tie an opening in fabric closed/shut.
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 tie consisting of a cord that goes through a seam around an opening; "he pulled the drawstring and closed the bag"

pajama
(usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers
Pajamas, also spelled pyjamas (see also spelling differences) can refer to several related types of clothing. The original paijama are loose, lightweight trousers fitted with drawstring waistbands and worn in South and West Asia by both sexes.
a pair of loose trousers tied by a drawstring around the waist; worn by men and women in some Asian countries

pants
Rubbish; nonsense
(pant) breathe noisily, as when one is exhausted; "The runners reached the finish line, panting heavily"
Trousers
bloomers: underpants worn by women; "she was afraid that her bloomers might have been showing"
(pant) the noise made by a short puff of steam (as from an engine)
Underpants