I talk about silk thin scarves not about cashere/silk as these are like cashmere scarves
The problem is that the right silk scarves are not readily available. The 2 below are respectively 23 X 180cm and 48 X 150cm. I think they are probably warm enough for many uses:
http://shoponline.drakes-london.com/zoomx-103-145-554-3-Scarves-100%20silk%20scarf%20with%20hand%20knot%20fringe.aspx
http://shoponline.drakes-london.com/zoomx-84-1-314-3-Scarves-100%20silk%20printed%20scarf.aspx