A bumbershoot is an umbrella.
bumbershoot definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Slang an umbrella
Origin: jocular alteration and merging of umbr(ella) and amp; (para)chute
bumbershoot definition by American Heritage Dictionary
Origin: Alteration of umbrella + alteration of (para)chute.