This is the yarn I am using for the Castle Cat Couture (CCC) hat.
It is RYC Soft Lux - 64% merino wool, 10% angora, 24% nylon, 2% metallic fibre, 125m/137yds per 50g ball.
I dug a ball (Camel) out of the sale bin at John Lewis in January for my swatches, then bought another batch of it (Cashmere, colour shown here) from RKM Wools to work on the full scale hat.
While it does not look very promising on the ball, I have found it easy to work with and its 'boucle looking' texture disappears when it is knitted. There have been moments while knitting, where I have worried that it looks very plain. Then a reassuring ray of light has caught the hat, making the metallic thread glitter and bringing it to life.