Cocked | Webster's Dictionary of the English Language

three-cocked hat
A silly article of sea-wear now happily passing away, retained only by coachmen, lord-mayor's men, a...

The Sailor's Word-Book
knocked into a cocked hat
Knocked out of shape; spoiled; ruined. The allusion or metaphor seems to be that of the hat of some ...

Dictionary of American Words And Phrases by John Russell Bartlett.