They are, but I still would not wear them. (And no rings for men unless you are married or have been a champion in basketball or wrestling.)

Let's differentiate two cases in whom we may want to address: 1) Aspiring rationalists: That's the easy case. Take an awesome shirt, sneak in "LW" or "pi" somewhere, and try to fly below the radar of anybody who would not like it. A moebius strip might do the same, a drawing of a cat in a box may work but also be misunderstood. 2) The not-yet aspiring rationalist: I assume, this is the main target group of InIns. I consider this way more difficult, because you have to keep the weirdness points below the gain. And you have to convey interest in a difficult-to-grasp concept on a small area. And nerds are still less "cool" than sex, drugs, and sports. A Space X T-Shirt may do the job (rockets are cool), but LW concepts? I haven't seen a convincing solution, but will ask around. Until then, the best solution to me seems to dress as your tribe expects you to find other ways of spreading the knowledge.