Men's underwear has hardly changed since the 1930's when elastic waistbands were added to men's boxers and Jockey introduced the Y-vent knitted brief. And since then men have been separated into two camps by their choice of underwear.
It's only partly punny to acknowledge that underwear plays a critical supporting role for a suit-wearing man. For a suit to live a full life, it should have as little contact with the body as possible. Going commando runs up the dry cleaning bills. Besides, unlined tweed is really scratchy.
I have to admit that I'm a briefs guy myself, but I give the boxer credit. Shirtmakers can supply boxers made from shirting cloth and I'll bet that somewhere there is at least one fanatic who commissions a pair of matching boxers for each shirt ordered from his shirtmaker (guys who wear nothing but white shirts don't count).
Fancy fabric isn't an option for brief wearers but we enjoy better support without the risk of a wedgie. And that's enough for me.