celebration boutonniere usps forever stamps sheet of 20 - new stamp issued 2017 usps celebration boutonniere is a new stamp issued by the u.s. postal service. similar in design to the two-ounce celebration corsage stamp, it can be used on rsvp envelopes often enclosed with wedding invitations. it is also perfect for party invitations, thank-you notes, announcements, or any other correspondence. for centuries, boutonnieres—or buttonhole flowers, as they were called in britain—were a staple of a well-dressed man’s outfit. for most of the 20th century, a single flower pinned to a lapel or inserted into a jacket buttonhole was part of a sophisticated, debonair man’s wardrobe. today, boutonnieres, still very fashionable, are worn at weddings by the groom, groomsmen, father of the groom, and best man, and at other special occasions, including proms, anniversaries, retirement parties, or military memorial services. art director ethel kessler designed the stamp. the boutonniere was arranged by floral designer carol caggiano and photographed by renée comet. a forever stamp, celebration boutonniere will always be equal in value to the current first-class mail one-ounce price.