There are corsets designed specifically for men. Google "men's corsets" and be delighted.
Keep in mind, though, that any flesh which gets squished or compressed will go -somewhere-. Be prepared for a bit of extra you at the top and bottom of the corset/shaper.
Tom Petty [Final Fantasy XV] (9%)
Bondage Finch [Bondage Finch Adventures] (12%)
Your Mother [Debbie Does Dallas XXIII] (8%)