Intrerestingly I'm getting ready to go out for a day hike in a wool kilt. It isn't raining right now, but they are calling for snow this afternoon.

I've been caught out in the rain, and soaked, in lots of different types of kilts. My experience is similar to that of FM. I have gotten the horrible behind-the-knees nuclear red chafing, however, but only once, and that was with a soaked poly-cotton kilt. Hemmed Polycotton fabric has a very sharp edge and it wore me out in no time. The main problem was that this particular kilt was a bit too long for me (one of my early DIY efforts before I finally settled on the perfect measurements). My wool hiking kilt has never been a problem.

Take home lesson: Be sure that your hiking kilt rides above the knee cap (and stays there throughout the hike!)