I'm not sure if the answer is obvious to this question, but men are allowed to go shirtless, right? For barbarian weekend I'm thinking of going shirtless and I wasn't fully sure of the policy.
Oh... I've seen a LOT of people shirtless... not just men! As long as you are abiding by the law you can wear whatever you like. It can get a bit chilly, or a bit crispy, if the sun is beating down... but LOTS of guys go shirtless.
If you are a patron, you can pretty much what you wish barring anything outright illegal.
Keep in mind that if you are not used to being outside with exposed skin, even if it is overcast, you can get a really bad sun burn (or wind burn). It's something you don't notice is happening until it is too late.
So it's a good idea to lather on the sunscreen every hour or so.
And if you happen to be with any well endowed ladies, remind them to use the sunscreen on any part that is not usually uncovered for hours on end outside.
Thanks for all the input. I am a guy, sorry if that disappoints some :) I'm a *big* believer in sunscreen (they had that back in the day, right?), so I plan on slathering it on liberally.