Only when an invitation says "black tie optional" does a gentleman have the choice between a tuxedo and a suit. Even then, there are rules of etiquette and style that the gentleman might use to make his choice.
Definition
Etiquette maven Emily Post describes "black tie optional" as either a tuxedo with a pleated or piqué shirt and black bow tie, or a "dark suit, white shirt and conservative tie." "Black tie optional" does not allow for lighter suits, sport coats or no necktie.
Etiquette
Even if an invitation says "black tie optional," the host or hostess intends the affair to be elegant. A tuxedo is more respectful of the host's intent.
Weddings
A gentleman who is invited to a wedding should opt for the tuxedo, unless he is a member of the wedding party, in which case he should coordinate with the other members.
Body Type
The tuxedo is designed to flatter any body type. A hefty gentleman will look more lean, the lean gentleman more substantial.
Black vs. Brown
Stick with black, blue or gray suits, without patterns if possible. Brown, green and earth tones are more casual.
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