Now that we've all spoken about what we/they believe is holding up his pants, let's look at REALITY!
It is obvious, when one inspects said photograph, that it's the invisible suspenders...... yeah, that's the ticket..... little, invisible suspenders made from flesh-colored dacron thread. You know.... the same kind of thread that is used to suspend people in the air on stage. Anyway, it should be obvious!
OR...... could it be that he just put the seam in one of his multitude of fat-folds around his middle section. That is a more mundane explanation and somewhat less fulfilling that invisible suspenders.......
I do have one question, though...... why does he insist upon jutting his midsection out so obtrusively? Is he trying to say something about his "size?"