Eliezer uses the word 'vulnerability'. I think this is close to what they are trying to signal, which is 'harmless'. It is a good strategy to have a very disciplined dress code, and build a brand as having a 'dorky', squeaky-clean manner, so that people feel comfortable allowing the missionaries in their home. In my home town anyway, they went door to door and I had no qualms about inviting them in, knowing that any odd behavior would be newsworthy, and quickly become widely known, exactly because the branding is so strong.

I'm not sure that we should adopt any kind of dress code at all, other than not offending the fashion sense of others inadvertently. Perhaps something small, like a sigil that people could wear as jewelry would be sufficient?

Branding ourselves should only be done after we become an effective group, and one that is admired. We want to be known as 'those sensible people that get things done', not 'that group of nerds that talks way too much about how my thinking sucks'. Eventually we'd like everyone to aspire to rationality, not just the people that test over some arbitrary IQ score.

Edit - please disregard this post