the english word "suit" entered the language in the late 13th century from anglo-french "suite" and old french "siute," meaning "a following, pursuit, or retinue." this old french term derived from vulgar latin "sequita," a feminine noun from the past participle of latin "sequi," meaning "to follow." the core semantic thread from the proto-indo-european root "sekw-" (to follow) is preserved in the word's evolution. the original sense of "a retinue" or "things that follow together" logically extended to a "set" of things, such as a set of matching garments or a set of legal petitions that follow a case. thus, the modern meanings of a matching outfit, a legal action, and a card category all stem from this foundational idea of a group or sequence that belongs together.

the word is a simplex loanword from french. it is not productively segmented into smaller, meaningful morphemes in modern english based on its current spelling.