I've looked everywhere for this and just can't find it (though there are countless topics on the subject of Int 3 apes with weaponry...):
When creating armor for an ape, is it humanoid or non-humanoid?
Yes, it's more or less human-shaped, which is the technical definition of humanoid, but their movement is SO non-human that I can't imagine human armor would work well on them.
Anyway, my druid has 20 gp riding on this question. :)