Make sure the chair is outside the robe at frame zero. Let the robe drape a few frames, then slide the chair under the character and then have them sit down. I bought this a few days ago, but have yet to give it a go as I have been doing other things in P8. If you want I can give it a try and report back here my results over the weekend.

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"