I've always had a soft spot for suspenders. It's my love of all things 20's and 30's, I think. That and growing up in the 80's when they had a resurgence. I've got a half dozen pairs and no pants with buttons to accommodate them.
The references to conserving rubber is an interesting one. The war years were rationing years and nothing escaped the ration board's roving eye.
$1.50 a pair too? You definitely got a lot more for a dollar back in the 40's!