My husband is bigger than your friend and while Kokotat does make custom items they only shorten and lengthen arms and legs.
Your best chance at a Kokotat would be the XL King and it still might not fit.
IR has the XXXL that is HUGE, I guarantee it will fit him, it has plenty of room across the shoulders, chest and back.
You can also find bigger gear for waterskiing in the 3 and 4 X size, mostly drysuits but IR is your best bet.
Also, IR stands for Immersion Research.
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