Just a few comments from someone who hikes in a kilt literally daily in the summer and very often in the fall/winter/spring:

1. Hiking in acrylic in temps over 70 F is miserable.

2. Hiking in acrylic in temps less than 45 is miserable.

3. Hiking in Poly/Cotton in temps over 45 is wonderful.

4. Hiking in Wool in temps below 45 is wonderful.

5. High-waisted kilts are a great advantage if you are using a "real" pack with waist belt. The belt rides on the kilt, not above it, and so the belt doesn't try to shove your kilt down a you walk.

6. PV is a wonderful alternative to the above, assuming that the temps are reasonable. I've used them with good success in the past, but of the 9 hiking kilts I own right now none are PV. Interpret that as you will.