I got out a bag of Christmas clothes yesterday, and I found a pair of suspenders I'd somehow acquired a couple of years ago. They were adjustable, one-size-fits-all red elastic with Santa heads running down the length. I don't recall ever using them, but I did today when I wore suspenders.
I clipped the suspenders to my pants in the front and the back. My shirt needed to be tucked in, which was a problem after too much Thanksgiving! Thank goodness for stretch denim.
I didn't even have to unhook them when I used the rest room; I was able to slip them off my shoulders and pull them back up when I was finished.