A person who makes or sells cotele fabric, or historically, someone who works with ribbed or ridged materials.
From cotele plus the agent suffix '-er' meaning one who makes or deals with something. This occupational term would have been common in medieval textile markets and guild systems.
Medieval towns had entire guilds of cotellers who guarded their textile-making secrets like treasure—the way they created those perfect ribs was proprietary technology worth a fortune!
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