Wiktionary
n. A waterproof hat, expected to be worn during rains.
Usage examples of "rain hat".
Today, though, she was nothing but serious, and she wore a clear plastic rain hat.
Some of it crackled around the highest tower of Don'tgonearthe Castle, and on the rain hat that Igor wore to stop his head rusting.
There was the Jolly Sailor on the front, with his big grin and big yellow rain hat and big beard, with big blue waves crashing behind him.
She put on the jacket again a black rain hat that was Owen's-more for camouflage than to protect her drenched hair.
The door was answered by an elderly woman in a red mac and a crinkly plastic rain hat.
Even framed by the snugly buttoned yellow collar of his slicker and the drooping yellow brim of his rain hat, Corky’.
The door of the diner came flapping open and Groucho, clad in a yellow slicker and rain hat, came hurrying in out of the wet night.
My father was wearing his raincoat and his rain hat--he looked like a salesman back from a two-week road trip.