Slacks vs. Trousers

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Difference Between Slacks and Trousers
Slacksnoun
(dated) Semi-formal trousers that are less formal than those part of a suit but suitable for wearing in most offices and therefore nowadays no longer considered casual trousers. (Takes a plural verb even when referring to a single pair; may be referred to as a pair of slacks)
Trousersnoun
An article of clothing that covers the part of the body between the waist and the ankles or knees, and is divided into a separate part for each leg.
The trousers need to be shortened.Why can women wear trousers when men can't wear skirts?Slacksnoun
(usually in the plural) pants for casual wear
Trousersnoun
(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 trousersADVERTISEMENT