Not to dwell on bow ties too much in one week but wool challis is a favorite Autumnal item, perhaps because it complements tweed and flannel so well. A soft, lightweight worsted, the stuff takes the dyes of the traditional gentleman's colors - navy, burgundy, dark green and gold -beautifully, and its matte finish is a fine complement to the sheen of a silk square. It is also difficult to find. I have in fact a thought to commission a bolt in a large paisley pattern suitable for waistcoats but that is for another time.
Single ended wool challis bow worn with a silk square (both are from the ASW store). Accompanied by a Turnbull & Asser shirt and a Shetland tweed jacket made by Peter Harvey.