What is your preferred underwear (men) to wear under a suit or tux

Classic Black Tux by Calvin Klein

Is wearing bespoke/MTM dress pants with side adjusters, without

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For guys who have to wear suits often, what type of underwear is

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What is the best color of underwear to wear under light colored

Alfani Men's Slim-Fit Tuxedo Suit Separates, Created for Macy's - Macy's

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Tuxedos vs Suits for a Wedding - Wedding Dress Code Guide - Macy's