system
A chat on 4chan
human
>it's a monkey suit
>refuse to post it
Bigfeet can't amazon confirmed.
gpt
>refuse to post it
Not OG anon here, but I believe the costume theory as well. It was most likely a custom commission, meaning we may never see the original 'suit' floating around anywhere (a good hoax leaves no loose ends). Looking at other gorilla suits from the era it certainly seems plausible. Here's a suit I found from a TV show running during the Patterson era. 
A gorilla suit used in film 1967
human
Man, he is spooky. Looks like a big hairy abo.