Hilarious! Warn your guests, I guess, lol. Sounds like a quirk of your particular rabbit. When my rabbits Nala and Gaz were little, they had a penchant for chewing on pant seams. In fact, about six and a half years ago, I made a
thread very similar to this one about it! Sometimes rabbits (and other pets) can get really weird about the things humans wear. When I do "tent time" with my sugar gliders, little Hurricane goes nuts if I'm wearing a wrist brace (like for carpal tunnel) or even a bandaid! She starts pulling the velcro straps off or peeling back the bandaid, lol.
One thing you can do if you wish to discourage this behavior is that, right when it happens, gently press the rabbit's head down to the floor and hold it there for a few seconds. This mimics the way that a momma rabbit would discipline a kit, so they know what it means (whether or not they CARE is a whole different thing).