trouser,
pant a garment (or part of a garment) designed for or relating to trousers; "in his trouser's pocket"; "he ripped his left trouser on the fence"
skirt a garment hanging from the waist; worn mainly by girls and women
Verb
zipper -
close with a zipper; "Zip up your jacket--it's cold"
A zipper is a popular device for temporarily joining two edges of fabric. It is used in clothing (e.g. , jackets and jeans), luggage and other bags, sporting goods, camping gear, and other daily use items.