5-6%? That's laughable...I concur with the fellow that said 12-15%. Around 10% and below, you should see ab definition, and you have none of that.
I also agree that the jacket makes you look fatter than you are.
On white leather, I have had excellent results with mr. clean magic eraser. I don't know if that success would translate well to red leather though. I suggest you give it a shot in an inconspicuous spot.