My girlfriend wears a simple shirt with an original Star Trek logo on it, plus the Starfleet insignia. I think it's pretty awesome.
But, I personally would never wear a Star Trek gag shirt, like "keeping up with the Cardassians." Even though I'd admire someone who I randomly saw wearing that, simply because they like Star Trek. I wish there were more elaborate, non-joke Star Trek shirts out there (that I could find at least) with something more than a logo and one symbol. Something withOUT a logo or writing at all would actually be very cool, if it had some vivid imagery of say a half Captain Picard, half Locutus face covering the front of it. But I know of no such shirt.
But, I personally would never wear a Star Trek gag shirt, like "keeping up with the Cardassians." Even though I'd admire someone who I randomly saw wearing that, simply because they like Star Trek. I wish there were more elaborate, non-joke Star Trek shirts out there (that I could find at least) with something more than a logo and one symbol. Something withOUT a logo or writing at all would actually be very cool, if it had some vivid imagery of say a half Captain Picard, half Locutus face covering the front of it. But I know of no such shirt.