Boutonnière

thumb|A boutonnière worn pinned on the lapel of a black tie|dinner jacket thumb|Young men wearing boutonnières A boutonnière () or buttonhole (British English) is a floral decoration, typically a single flower or bud, worn on the lapel of a tuxedo or suit jacket.

While worn frequently in the past, boutonnières are now usually reserved for special occasions for which formal wear is standard, such as at proms and weddings. (Women who wear jackets on these occasions may also wear boutonnières, but more typically a woman would wear a corsage.) Nowadays, lapel pins are worn more often than flowers on business suits.