the.com/garrison cap

A hat designed to fold flat, so soldiers could pocket it and still look sharp.

means A folding cloth military cap, creased flat down the middle so it sits askew on the head and tucks easily into a pocket or under a belt when not worn.

from Named for the garrison — the body of troops stationed to guard a fort or town, from Old French 'garison' (defense, protection), itself from 'garir,' to defend or make safe, a Germanic borrowing related to 'warn' and 'ward.' The cap took the name because it was the everyday headgear worn around the garrison rather than the formal dress hat of parade. In American slang it picked up a far earthier nickname during the World Wars, but that one we'll leave folded in the pocket.

folding genius
Collapses flat to tuck under a shoulder epaulet
crude nickname
GIs called it the cunt cap, unprintably
global spread
Worn by armies on nearly every continent
origin
Evolved from WWI field service caps
still serving
Remains standard issue in many militaries today
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