Angie, I missed that you replied to my comment in that blog post. I'll go back and look for it.
For me, personally, when I said "intelligence" I was thinking of a fairly rigorous, academic, intellectual form of intelligence--scholarly intelligence, or book smarts. This is obviously not the only type of intelligence a person can have!
For me, in terms of clothing, this translates to intelligence and rigorousness in design, and a strongly individual, independant, even renegade aesthetic (I'm often not drawn to what's trendy because of this, although if I like a trend, I'll wear it. I'm just not concerned with being on-trend). It also usually translates to clothing I can't afford! I like clothing items that look like they required some real thought to produce, and I like this to be expressed in sharp, unusual details. That's why I'm drawn to items with clean, strong, unusual lines and origami-type detailing. To me, they express intelligence, and they make me feel intelligent when I wear them. Actually, that helps me think of more specific adjectives: clean, strong, sharp, detailed, original, stubborn, unusual, elevated.
Dries van Noten, Yohji Yamamoto, Ann Demuelemeester, APC, Obakki, Kooba, and Evan Biddell are all designers that express this for me (not that I own anything by them, at least not yet). That's partly why I'm doing a lot more wardrobe purging than shopping right now--I'm working clearing out the stuff I own that isn't me, and on figuring out how to work items like the ones I admire and enjoy wearing into my wardrobe on my budget.
I enjoyed that thread that you linked to, especially since my ultimate goal is to be a professor--thanks!