That was completely rad. In a day and age where sponsorships are a HUGE part of the sport, the dude comes out with plain black shorts with a fleur-de-lis. Not even sponsors on a t-shirt, just his normal gi.
Basically, "Screw the money, I'm here to destroy."
Yeah, GSP said in the press conference afterwards that a sponsor paid him to not wear any other logos. Presumably this relates to the Afflication ban in the UFC.