Knitted diamond pattern (6)
I believe the answer is:
argyle
'knitted diamond pattern' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for argyle that I've seen before include "Coloured diamond pattern on knitted garments" , "Pattern on knitwear" , "Old Scottish county; part name of a W Country football team" , "Lozenge pattern (socks)" , "Of diamond - patterned material" .)