If your shirts are long enough, there's always the pregnancy trick of using an elastic between the button hole and the button to close the 32s.
I think a belt for the 34s is your best bet, unless you want to bring back suspenders.
It doesn't have to be a belt-belt though. Scarves can work too.
If you can sew (or know someone who can), a dart in the waist of the 34s should help too.