I have been weaving a Collapse Weave Scarf using 2/21 Wool and 50/2 high twist wool yarn. The structure is 1/3 and 3/1 twill in stripes.
This is it on the loom.
This is it off the loom before washing.
I finished the scarf with a soak in warm water and the magic happened. It collapsed into neat pleats with the colours on one side and the dark purple on the reverse.