matchcoats

Example:On a casual day, he wore a t-shirt and jeans, not the matchcoats of his suit.

Definition:Not formal, proper, or required by circumstances; performed or done with little or no formality or concern.

Example:As he preferred a casual look, he did not bother with a matchcoats for his night out.

Definition:Of or pertaining to official or official-sounding documents, language, or procedures; stilted and far from natural; not colloquial or conversational: opposed to natural, familiar, and informal.