Good on you, but this doesn't prove anything imo. People are almost always positively biased toward attractive faces due to the halo effect. Biologically/psychologically this is a result of one's facial bone structure, skin, and bodyfat levels.
So being shabbily dressed and having stubble is mostly irrelevant here. Maybe you were just much better looking than the other (poor) bloke.
Maybe I wasn't being clear in the last line of my response. I agree with this "People are almost always positively biased toward attractive faces due to the halo effect."
The point I'm trying to make is in addition to that there might be other forms of appearance-based biases: for ex maybe a scientist is expected to project an image of being nerdy, or detached-ly pensive, etc
So being shabbily dressed and having stubble is mostly irrelevant here. Maybe you were just much better looking than the other (poor) bloke.