Boutonniere
From Wikipedia, the free encyclopedia
A boutonnière, also buttonhole (British English), is a flower or floral decoration which was traditionally pushed through the buttonhole of a jacket, but in modern times is most often pinned onto a gentleman’s lapel.[1]
While worn frequently in the past, boutonnières are now usually reserved for special occasions for which a dinner suit is standard like proms and weddings.
It is an American prom custom for the female to purchase the boutonniere for her male date and for it to match her corsage. A bridegroom will almost always wear a boutonnière on his left lapel.