"Pants" is the Engpsh word for "裤子." The word originated from the 17th century in England, originally meaning "trousers." Nowadays, it is commonly used to refer to all types of pants, including casual wear and formal wear.
Here are some examples of how "pants" is used in Engpsh sentences:
I need to buy a new pair of pants.
(我需要买一条新的裤子。)
She wears pants to work every day.
(她每天穿裤子去工作。)
Those pants are too tight.
(那条裤子太紧了。)
He always wears dress pants for special occasions.
(他总是穿正装裤子参加特殊场合。)