I always dress appropriately.
Always casual, always good!! Doesn't matter how to dress, you're welcome.
You feel a little underdressed if you go with a tshirt, jeans and snickers but we were just walking by and we were welcomed with no problem.
Definitely seemed like nice casual attire is acceptable there (I was there about 3 weeks ago)
I have been in Fall and Summer and dressed casual both times. Nice not sloppy but casual.
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