DCHP-1 Online
cow's breakfast Slang 
a hat, especially a straw hat.
- 1900 Nothing looks more out of place than a pallid face under a policeman's "cow's breakfast" (as the slouch hat was sometimes styled).
- 1959 . . . he returned through the streets . . . quite oblivious of the very un-naval "cow's breakfast" [straw hat] still on his head.
- 1900 Nothing looks more out of place than a pallid face under a policeman's "cow's breakfast" (as the slouch hat was sometimes styled).