I have a question. Whats the difference between the Poly viscose tartan fabric (ie what USA kilts use) and Acryllic tartan fabric (ie what Stillwater kilts use)? I don't own a kilt made from either of those fabrics, but have heard good reviews. Could anyone who has both types or is familar with the materials let me know? Some possible comparision points: ease of wash, swing, heaviness, stain resistance, how well the pleats hold their edge, wrinkle factor, wool like feel, etc...