One who makes collars, esp. for horses and other draught animals.
148190. Howard Househ. Bks. (1844), 229. To Lely, a coler-maker, for xiiij. dayes makenge colers, and mendynge of horse herneys.
1580. North, Plutarch (1676), 138. Cordmakers, Sadlers, Coller-makers.
1742. J. Yarrow, Love at First Sight, 104. My neighbur Thong, the Collar-maker.
1885. C. Mackeson, Brit. Almanac & Comp., 94. Double meanings [e.g.] Collar Maker for a Seamstress or Harness Maker.