Records are put in these parts of jackets (7)

I believe the answer is:

sleeves

I'm a little stuck... Click here to teach me more about this clue!

'records' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for sleeves that I've seen is " Arm coverings".)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.