you're regular street clothes that you wear when out of uniform. this includes any uniforms: work, band, military, school, so on.
also refers to costumes or any other required dress you wouldn't be seen in on a day to day basis.
show up to practice in your civies, then we'll change into our performance clothes later.
i brought civies to change into right after the game so i can still go out tonight without looking like a retard in my uniform.
to be all good, or alright, or to be thick gravy goodness
1:I'm so sorry i can't make it to the movies tonight with you
2: It's huggiebear. i don't mind.