It is a top-down, spiral cowl/shawl. It needs to be blocked so that it will lie flat. If it is small, wear it like a cowl. If it is big, wear it like a shawl. Any yarn and colours will be great for it.
Gauge is not important.

Measurement: top edge16” x bottom edge 66” x 9” wide

I crochet in back loop for every row.