I bought a few spools of Gutermann's silk yesterday, one of which is a sort of variegated olive colour. It is labelled as Gutermann Sulky 100% cotton, CA02776, COL4020. It's a little thicker than Pearsal's, so getting a nice head was difficult, but I like the results.
HOOK - Kamasan B175 #14
THREAD - See Above (unwaxed)
HACKLE - Brown Partridge
BODY - Single layer of thread wrapped from shoulder to bend
RIB - Thread wrapped back up to the shoulder in an open spiral.
Exactly the same pattern, but this time I waxed the thread.