Nah it's fine. Hosted plenty and some wear some don't. It's really about respect for the regular folk who aren't into kink or exposing to kids.
Eventually, hopefully, luckily, the munch is suppose to lead to a more private setting. We use to have New Years parties and things where it was an open forum in a hotel or private residence.
Munches are ment to be an introduction to the community and you. Long as you don't do anything that could be construed as unacceptable in public more than likely you'll get to attend a more private open event. But your experience may vary by location, munch, and host.
Be polite and kind and I imagine you'll get the same in return. You also may or may not run into people that don't agree with it, but remember "my kink is not your kink." Vast majority of other kinks I've met don't care or are indifferent but accept it, there will be a few that don't agree or like it. But if they put you down, their not good kinksters. Or people.