coqueluche

plural coqueluches

1. obsoleteA type of hood historically worn by those infected with whooping cough, to keep a warm head.

   […] because the sick wore a coqueluche on their heads (as a part of the treatment prescribed) certainly owes its currency to Dr. Short, but he appears to have relied upon the authority of Schenkius […]

   1922, Francis Graham Crookshank, Influenza, page 73

   1 more example

   The coqueluchon or coqueluche was a kind of hood very generally worn at certain periods of the year, which seems to have given its name to the hooping-cough, because those who were attacked by that illness wore a coqueluche or monk's hood to keep their head warm.

   1896, Alphonse Mariette, French and English idioms and proverbs: with critical and historical notes, page 104