There seem to be idiots on both sides of this issue. The idiots who think you need to wear a suit to pitch liberty need to recognize that there are people--many of them naturally libertarian in thought--who resent "suits" (as a term for people.) The idiots who seriously think you can walk into any room wearing anything you want and get recognized as someone with something serious to say need to recognize the power of attire in creating rapport as a first step to persuasion.
That said, the fashion nazis and fashion slaves can kiss my ass. In my personal life, I'll wear what the fuck I want to wear. This seems to me a very libertarian attitude, and it's fine if you don't make a habit of offending with your attire, at which time YMMV. Alternatively, if I'm trying to "sell" myself or my ideology to someone, I'll take some time to create rapport, and that very well may include attire. Mostly, though, I'll be who I am, and that does not include being a fashion slave. Yet, not being a fashion slave does not necessarily mean being sloppy. Clean clothes, a lack of malodor, and a pleasant, disciplined stature can go a long way.
The bottom line, though, is rapport, and anyone who's had any type of communication education knows that means being aware of your "audience" and knowing that much of the message you send is subliminal, including your attire (though as in the case of the yelling dude in the suit, in some other thread here, attire can only help so much.) In this way, Michael Badnarik and Ian both get an "F" for being obtuse and entirely missing the point. Being on radio, however, Ian rarely has to care, so it works out for him. I encourage Mark to continue reminding him when they're together and it does make a difference (such as, conventions.)