ABOUT MERC. A resolutely British brand, Merc is for the new school mod. Taking inspiration from the days of the Northern Soul movement, Paul Weller in his The Jam days and. Quadrophenia. , Merc take these style cues and update them for today's discerning man (that's you). Their polo shirts, jackets and shirts will have you humming the bassline from "Start!" all day long. Body: 100% Cotton.