Crossword Genius

Garments made initially out of loose dresses (5)

Ross

I think it could be either:

socks

sacks

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

'dresses' is the definition.
(I know this)

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

Can you help me to learn more?

(Other definitions for sacks that I've seen before include "Raids; boots out" , "Plunders; fires" , "Bags; wines" , "Discharges" , "Dismisses; bags" .)

I've seen this clue in The Sun.
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