Sounds like you and I had similar weekends...and I had a mustard incident yesterday much like your beans! I had family picnics on both Saturday and Sunday with both sides of the family and wore my kilt both days. My wife has a mustang and I didn't experience any major difficulties sitting in a car...I've found the best way is to put my butt in first and slide back to keep the pleats neat, then spin my legs...if you try to only sit on the edge and slide sideways across the seat, you're going against the pleats and they'll bunch up. Other than that...I'd say don't worry about the underwear or no underwear thing...people make WAY too big of a deal about it. Being in the military I would tell you that about half of the guys I know don't wear any at all...ever. A kilt is just like a pair of pants...if you want to go traditional, do it...if you feel more comfortable with briefs/boxers...then wear them.