I'd bet he would go for camo face paint.
as far as gloves any dark jersey glove will do. My wide buys my grandkids those stretchy gloves. We use black.
JW
My 10yo has been doing the facepaint thing since his first time in a tree when he was 3yo (you talk about engineering I had to ziptie the harness to get it to fit him).
It gives them something to do in the blind or up in the tree when you notice if they don't move they will explode!!!
BTW keep at it with them swamp. Just this last year me and my 10yo sat from 5 1/2 hours in an evening sit waiting for a buck to get up off his bed, but our first sit when he was three was 15min.