Wool would be the best. Mine is wool.. I think.. at least it looks like it.
As far as the colour I am not sure myself. Sometimes I swore it looked blue and other times it looked very much grey.
With mine I went with a grey colour. dark-ish grey... slate.. ish? It sure is a jacket.
If David Tennant ever asked me to run away with him I would. I do not think I could ever say no to that man!
Captain Jack Harkness (Torchwood/Dr Who):100% Saturday and Sunday
Victor "Sully" Sullivan (Uncharted):100% Friday and Monday