Does 6'2", 250 lbs count as big? If so, here are my two cents. Yes, wear the kilt at the true waist. Yes, darker colors can be more flattering-but not always: sometimes they just make you look like a very dark, brick wall. Also, consider wearing the kilt AT the top of the kneecap as opposed to the middle of the knee, and making sure that kilt hose go no closer to the knee than 3 fingers below.

Bryan...but that's just my opinion: I could be wrong...