Men's pants used to have significantly higher waistlines than they do now, often ending directly at the wearer's actual waist, before World War II. Men wore suspenders to keep their pants up. Due to fabric shortages during the war, manufacturers discovered they could reduce the waistlines of pants and save money. Belts started to take the place of suspenders as a means of preventing pants from dropping down around the same period, which is why it's regarded quite the fashion faux-pas to wear a belt and a suspender simultaneously. It's a bit of a function overload because they both perform the same action, and it also doesn't look correct. So keep in mind the golden rule of sartorial suspender wearing: no matter the style of suspender, wear no belt.
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