Men always struggle wearing belts, constantly fighting with the leather that restricts their bodies. It never fits right, required to be repeatedly adjusted when they sit and stand, refitting it whenever they stuff themselves full of food. It always places a limit on how much they can eat, but once they switch to suspenders they stop worrying about it altogether.
They no longer need to worry about cinching their belt tightly against their stomachs, now allowing their bellies to grow bigger and bigger, the suspenders continuing to support them regardless of their width. They don't worry about their pants size, knowing the suspenders keep their bottoms in position instead of needing to be hitched up every few minutes. They continue growing larger and larger, not realizing that now their pants and belt won't stop their gut anymore, that their limit depends on their shirts.
They don't think about their tops as the fabric grows tighter and tighter on their bodies, thinking they're still the same size since their pants fit. Their shirts slowly begin straining against their guts, button holes beginning to stretch and reaching their limits. The bottom of their stomachs are visible at this point, hanging out for all to see while their waistbands sit snugly under the overhang. It's not until their first button snaps revealing their belly button that they realize they may have gone too far.