This drawing from The Tailor & Cutter is lovely; but it’s not really my style. Not because a white dinner jacket would be too showy unless I were dining in truly balmy weather. But, rather, because everything about it is too square. 

The effect begins with the lapels, which are both straight down their length and horizontal in the peak. It continues with the square, presumably heavily padded shoulders. Then the straight breast pocket, floating too far away from its lapel. The two bottom buttons are fastened, giving a sharp but square finish to the jacket’s bottom edge. The width of the trousers doesn’t help either. 

I like jackets with a little shape. Some curve, some flow, some movement. There is certainly an argument that a dinner jacket should be sharper than a regular suit, but this is too much.