I was surprised slightly that some didn't see my post as humor in part. Anyway, when I was doing research, I read the extensive professional legal and behavioral literature on appearance issues and it is convincing that appearance can have powerful effects. Some in the 'gun' world deny that with the good shoot mantra that implies the 'facts' will clearly acquit them. Findings that exposure to guns could be detrimental to the defendant was demonstrated. Some findings were counterintuitive to naive gun folks. Knowledgeable jurors might have negative opinions of various type of guns as indicating 'blood' lust. Gender had an effect if the female was seen as acting in variance to female stereotypes. There's lots of stuff out there.
There are scholarly texts on jury factors that are well worth the read for serious folks. Here's one Jury text.
Decision Making: The State of the Science (Psychology and Crime, 8)
by Dennis J. Devine | Aug 6, 2012
Just for an anecdote. Watched a case on CourtTV. Officer shoots a deaf or developmentally challenged young man with a garden tool who won't follow commands. He is charged. Now at the time of the incident, he has white side walls and a militaristic hairdo. At trial, he has a nicely grown out head of hair, is wearing a professional looking three piece suit and when he is on the stand, has some professional looking reading glasses. Very nice appearance - why is that?
BTW, there are different models of jury decision making. Some are linear sums of facts and other mathematical models. The one that is most popular (at least from what I read), is that the side that gets its narrative of events first and most compelling wins. The juror that buys that narrative then engages in selective information processing to attend to facts in accord with that narrative and discards ones that disagree and/or does not attend to them.