Down a Soho alley, an unassuming doorway leads to DM buttons. If you like your shirts or handkerchiefs monogrammed, this is the place to get them done at a reasonable price. David, who runs the show, is a London fashion institution and has saved the day for many a fashion house with last-minute buttonholes and embroidery at London Fashion Week.

The also make fabric-covered cufflinks—simply bring in a scrap of fabric you like and they will transform it into a pair for you.