Holiday Planning & Ideas Halloween Halloween Projects & Crafts Adult Halloween Costumes Gentleman's Suit Costume Transforming an office appropriate outfit into a costume, his look is embellished with an oversize posterboard shirt collar and jacket lapels — with a honeycomb boutonnière to add the finishing touch. By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on May 1, 2019 Share Tweet Pin Email Photo: BARBARA DONNINELLI What You'll Need Materials Gentleman's Suit Costume templates Small yellow honeycomb paper fan (Pictured: 6", in Yellow, $2 for 5, partycity.com) Double-sided tape Card stock Black railroad (or poster) board White pencil White railroad (or poster) board Small hole punch 2 paper fasteners Craft glue or pins Scrap of yellow tissue or crepe paper (Pictured: Single-ply crepe-paper fold, in Goldenrod, $1.50, blumchen.com) Instructions To make boutonnière, close fan and trim with a V cut, about 1 1/2 inches from tissue-paper end. Open and use double-sided tape to secure. Print template onto card stock. Assemble as needed and cut out. With pencil, trace onto black or white railroad board, as indicated on template pieces. Cut out. Fold as indicated on templates. Punch holes in paper shirt collar as indicated on template. Place collar around neck, over shirt collar, and put fasteners through punched holes to close. Drape lapels around neck, over jacket. Tuck into jacket lapels just above top front button. Tuck folded pocket flaps into pockets. Glue or pin boutonnière onto lapel. Tuck scrap of tissue paper into breast pocket.