I'll stick with calling BS.
I can't wear suspenders, I have neck problems. Can't wear bib overalls or bib-type rain pants anymore. I'm ok for a little while but then it starts to hurt ... bad. For some reason, my backpack doesn't do that ... I'm guessing it's a matter of them binding under other clothing like a jacket over the top.
If you're going to wear suspenders, I'd head for a loggers supply store. Those are guys who wear 'em and work in 'em so what they sell has to work, not just decorative.
Tom