Inspired by this I tried belting on an Army blanket standing up and it is fast and it works this does not however produce a pleated look. The modern heavy wool blankets are way too heavy to wear more than a standard length blanket say 60 inch by 60 inch which would be 4 yards. The 9 yard (135X60) kilt would have to be a very light material comparatively. We may have two weights of wool summer and winter, further we might have two weights of wool, thin high quality pretty stuff for show worn by the nobles and thick heavy rough wool in muted colors worn by those who actually lived and worked out doors.