Gotcha! It was the Caprice hair, I didn't remember the name until I read your description.
Thanks! We love our hair ourselves, even though it does not looks so since we don't create many, but our technique is a bit boring and finicky to get to those results.
It makes sense, we often refer to it as thickness, two sides of the same coin. Probably weight and thickness would describe it more properly
I'll upload those files for you!