first shirt

An Air Force term (circa 1960s). Another name for a squadron's First Sergeant.
Sometimes just called "The shirt"

"The captain and the first shirt are checking out the barracks today"
"The shirt is on my case and wants to give me an Article 15".

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first impression shirt

the shirt in your wardrobe that hangs in the closet with dust on the shoulders that waits until you need to make a good first impression

I was meeting my new boss today, so I put my sandals in the closet, got out my good shoes, some clean jeans, and my first impression shirt.

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