The reason why Nasser looks bigger than Jay is that Jay is wearing a fitted suit. That polyester blue thing that Nasser is wearing is straight from the "Big Boys Thrift Store" on the $0.45 rack of left-over 1975 imperfects. It's meant for fat piles.
Nasser looked alright in the other, normal looking sportscoat, but he looks like a douche in that blue thing. And the reason why Nasser isn't wearing a tie is because he only had $0.60 on him before the press conference; the tie was $0.20 and he couldn't afford it and the blue trash bag he is wearing.