When I went back years later and just went as myself, my wife and I were immediately welcomed in without much questioning. For those wondering, this is not a club where being with a woman is necessarily advantageous, but I will certainly admit that it likely had an impact.
The biggest things I saw them looking to screen out, beyond drunk - high - obnoxious, were youth and naïveté. They seem to largely be aiming at people who know exactly what they’re getting into, and are relaxed about it + not overly attached to the outcome.
Just so you know exactly what I had on, and how much it flies in the face of some of the advice... on Friday: White t-shirt, jeans, baseball cap. Saturday: Grey Everlane pocket t-shirt, backwards baseball cap, Patagonia 5” running shorts, Off-white Adidas Marathon sneakers. I did learn to dress like you’re going to dance for hours in Friday night, and jeans got hot and shirt came off real quick, so I adjusted on Saturday.
Wife went more classic and wore black jean shorts, black tee with a ripped collar, black baseball cap, black adidas.