I have 16oz wool for the dressier occasions and 12oz polyviscose for casual wear. Actually, they really can't be distinguished from one another. Still, even with the lining that's found in a proper kilt, it's just too fecking scratchy without something underneath as a barrier. Winters, I wear boxer briefs because I wear a kilt at least two or three times a week. A privilege of being retired....wool kilts!?