I knit occasionally and spotted some rather interesting looking 'wool' in John Lewis. It's called Lumio from the company Schachenmayr. http://us.schachenmayr.com/yarns/lumio
It's reflective and for my stupidly sensitve skin has the bonus of being 93% acrylc 7% other fibres. I took the other fibres to be whatever the reflective stuff is.
I have used it to knit myself a very basic scarf.
Untitled by Zenfrozt2013, on Flickr