loop stitch
Concise Oxford English Dictionary © 2008 Oxford University Press:
loop stitch/ˈluːpstɪtʃ/
▶noun a method of sewing or knitting in which each stitch incorporates a free loop of thread, for ornament or to give a thick pile.
– derivatives
loop-stitched adjective,
loop stitching noun.
loop-stitched adjective,
loop stitching noun.
'loop stitch' also found in these Oxford entries:

