Jeans Part is a term used to describe the different components of a pair of jeans. The three crossword solutions for this term are LEG (3 letters), SEAT (4 letters), and FLY (3 letters). The LEG of a pair of jeans is the part that covers the wearer's legs from the waist to the ankle. The SEAT of a pair of jeans is the part that covers the wearer's buttocks. The FLY of a pair of jeans is the opening at the front of the jeans, which is usually fastened with a zipper or buttons.