I've been kilted since 2003, but the only kilts I have ever owned were of 100% worsted wool and made by Lochcarron mills. I am seeing a lot of kilts made with Poly Viscose instead of 100% wool. What is Poly Viscose? How does it hang/swing? Does it hold pleats as well as wool? How does one care for this material? Can this material be worn as well in formal attire as casual?