Note to King Lear, 1.4.95

King Lear,
Act 1, Scene 4, line 95
coxcomb: —The traditional fool's cap, modeled on a cock's comb. In folklore, it was said that the rooster was such a fool that he thought that the sun rose because he crowed.

A Fool Wearing his Coxcomb and A Cock with an Impressive Comb