It was his taller brothers suit.
Granted....this looks more like a "tux" jacket (double brested) which tend to be longer....
but that style has been out for a while & this looks still about 3-6" too long for even that style.
The the pant legs need to have (1) break in the drop of the pant line. His has "rolls" which is again about 1-2" out of alteration.
Nothing worse than seeing an adult man dressed like a kid in his brothers suit.