civvies
Civvies (noun) means Ordinary, non-military clothing, especially as worn by someone who is normally in uniform. Example: “The soldiers changed into civvies before heading into town.”
How to use civvies
Learner’s notesIn plain EnglishRegular clothes, not a uniform — mostly used by or about military/police personnel.
Informal, mainly British/military slang.
Fill the gap
Can you complete this real example?
The soldiers changed into _____ before heading into town.
Etymology
A shortened, informal form of "civilian clothes."