In old photos and videos, especially from the 1920s through the 1960s, suspenders (or braces, if you're talking about the kind that button onto pants) seem to have been far more common than they are today, especially with suits (which themselves were more common). Why did they fall out of fashion so sharply as the 20th century wore on?
By no means am I discouraging anyone from answering your question (which made me chuckle:) ), but I think you'd enjoy reading this answer by /u/pipkin42