I need some advise from Gentlemen of Substance.

First let me say I wore my kilt out into the big bad cruel world for the first time tonight. I wore it to my Girlfriends house and she gave me her stamp of approval, which really was important to me, then we went out for a wee bite and a few pints. I was pretty comfortable, oddly enough, no one even paid me a passing glance.

Anyway, the only problem I have is sitting down, I've watched the great video from Kilt Rental on "How to Sit in a Kilt" and it was a big help, but as you'll note from the title of this thread, I am a Gentlemen of Substance. I'm 6'3" (190.5 cm) and 330 lbs (149.69 kg). My arms aren't long enough to reach around behind my fat butt and sweep my pleats under me on both sides, while still modestly pressing down in front of the kilt. Sitting on a tall bar stool was no problem, but sitting in a chair, even though I didn't see anyone watching was a bit embarrassing. One cheek was on the kilt and the other on the chair, it obviously required me to do a little adjusting. So how does a Gentleman of Substance sit properly?

Thank you in advance.