Diamond sock pattern (6)
I believe the answer is:
argyle
'diamond sock pattern' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for argyle that I've seen before include "Knitted or woven with diamond-shaped pattern" , "Design of diamond-shaped patterns - Plymouth ___, football team" , "Lozenge-patterned sock" , "Diamond-shaped knitting pattern" , "Diamond-shaped pattern for woollens" .)