My vote for best dressed megalomaniac goes to Qadaafi (or however you spell that name). Say what you want about his mental stability, the man is a trend setter on the runways.
Kudohs as well to Idi Amin Dada of Uganda who funked up the joint with his very stylish headgear. Speaking of headgear, any Russian politburo member knew that the best way to top of a polyester suit and plastic shoes was with a very tall dead furry animal. Very cozy.
Anyone else?