The word "suit" can have multiple meanings. Primarily, it refers to a set of clothing, typically consisting of trousers and a jacket, that is worn for formal occasions. It can also refer to a legal action or process in which someone takes legal steps to claim rights or seek justice. In a broader, more abstract sense, "suit" can mean to be appropriate or fitting for someone or something.
The word "suit" comes from the Old French word "suitte," meaning a following or a sequence, which is derived from the Latin word "sequi," meaning "to follow." Over time, the meaning evolved to refer to a set of clothes and later to legal actions.