Just my two cents: when I wonder about acceptability of clothing at an event, I'm wondering three things: 1. Will I be ostentatious? This would apply to the seersucker question. Few people would necessarily say "I don't think, according to my established, firm rules, that seersucker is appropriate after dark." But they may well say, "What's that guy wearing?" 2. If I am going to be very careful and choose appropriate, flattering clothing (and I've alread chosen carefully in my purchases) I don't want to make a simple mistake that offends anyone's sensibility, even if I personally think it's ok. For instance, someone to say, "How could a guy who obviously cares about his clothes wear a cashmere turtleneck in August?" 3. Last, will doubts regarding either of these question, or others, affect my own confidence. This is the most important; everyone will likely agree that we shouldn't worry so much what others think, and also that our dress, ideally, will look effortless. Sorry for the ramble, haven't posted in awhile, I was due. Â
I agree with discostu that the laity won't know and often won't care about our sartorial choices, but I think it's good to know if one is violating accepted rules, even if one thinks it looks good, no matter the rules.