While fabrics and patterns usually attract the eye first, the suit proportions anchor it in time.
It is always about balance!
A suit extreme in silhouette is more likely to go out of style before it falls apart.
In assessing a suit jacket's potential life span, five elements of design require particular attention; these are the bones of the garment. Should the coat architecture conflict with that of the wearer or; deviate too far from the archetype, the coat's staying power will be significantly weakened.
First Element: The Jacket Shoulder
As it's the widest dimension, the shoulder sets the mood for the rest of the jacket.
Since the jacket shoulders the shoulders of the jacket frame the head, if they are too narrow, the head will appear larger then its actual size; conversely, if cut too wide, the head will appear disproportionately small.
Notice the difference in the shoulder expression between the pictures below.
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