Fashion line? (4)
'fashion line' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for seam that I've seen before include "Line of sewing - stratum of coal" , "Join - stratum of ore" , "Sewn join" , "Join in material - layer of coal" , "Unfasten" .)
(Other definitions for stripe that I've seen before include "Length of material, maybe showing rank" , "Military mark of rank, chevron" , "Braid showing military rank" , "Long band of a different colour" , "Priest (anag)" .)