Yours on eBay for about 80 quid. This was sent in by a man who calls himself “Andy The Squirrel” so was no doubt discovered while in a “furry” wanking/browsing session. Which takes a little bit of the shine off the discovery, to be honest.

Sonic full body immersion wanking kit

SEGA really ought to knock out official ones. There’s clearly a market for full-body SEGA immersion suits.