from The Century Dictionary and Cyclopedia
- n. A striped woolen nightcap made in Kilmarnock, Scotland.
Sorry, no etymologies found.
"Old Redcap," the country folk used to call him, and they said that he was a wee, wee man, with a red pirnie  and twisted legs; but whether that be true or no, 'tis not for me to say.
"Tibby was knitting at a reid pirnie  for her faither; but, of course,