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Somewhere in Civvies was created in 1943.
The word "civvies" is spelled with two v's. It is a colloquial term used to refer to civilian clothing, as opposed to a uniform or military attire.
Flivver, flivvers, revved, revving, savvy, skivvy, civvy, civvies.
Go an be brave.
The RAF doesn't allow people to mix military and civilian clothing at all.