Ross i have a blue fox one here that was a big fit on me, it was loose when i last wore it as it had gone soft on the velco from me when i was a 32", so every size bigger than that would be oK as its unused teritiory after that. It looks like it woud go out a few girth sizes. yOU can have it for $5 and the postage if you like.
You can PM me you size if you want me to measure it out and see if it goes out there. I use the one on my Dainese armour so havent used it in 10 years or so, infact if you buy a body shell the kidney belts on them wrap around me twice so they would be bear size.
Are you a bear ?
if so you could use a trashed Body suits kidney strap as they would still be good also.
Any how if your interested.