trouser

nouns

(usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately
"he had a sharp crease in his trousers"
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"
is a part of
(usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately
"he had a sharp crease in his trousers"
is a type of (narrower)
an article of clothing
"garments of the finest silk"