Kilted or no, I always figger that you can always take off a necktie or a jacket...thus showing up "overdressed" can be toned down by the removal of one or the other. If it gets adequately casual, you can just roll up yer sleeves.

If you said pub casual in these here parts, I'd lay odds that anybody showing up in a shirt with a collar on it would be the exception. When I stop into the Duke wif a necktie on, they're agahst!

Best

AA