I second the onesies idea

I put them on Starr after her spaying and they're so cute and the stitches are covered.
I'd be wary of the glue. If he has an allergic reaction to it, he'll be miserable

It will itch for a long time. I wonder if there is some kind of test they could do (like put a little glue on him somewhere) to rule out an allergy before putting it on surgical incision?
Anway, I know that he'll do great and you'll spoil him rotten after