As someone with Social Phobia, I have always been obsessed with my appearance, and thus have always had an obsession with fashion. Don't laugh. I'm cereal.
Anyways, as most of you already know, what you wear has a significant effect on how people view you. Why? Well, we as humans merely adapt and learn by observing and associate what we have learned with other things. It is a sort of inductive reasoning we use to better understand the world around us. Rich, professional, or successful people tend to wear tuxedos, which is what we come to associate them with, which is why they help in interviews.
Some of you may know everything I say already, for others this may be the first time hearing stuff like this. In either case, feel free to skim or scrutinize whatever you see fit to.
Let' start with the basics: colors. What we associate colors is also dependent on a sort of inductive reasoning. Note that the psychological effects of colors are considerable, but not earth-shattering. They augment feelings towards the wearer, not set them. Combining colors somewhat combines the properties of the base colors.
Colors
Along with colors, there are many things that affect how others perceive you.
Concepts
There are a great number of subtleties that affect people's perception towards you as well.
Subtleties
That's all I can think of at the moment, at any rate. If you have any questions or potential additions feel free to tell me
Oh yeah, and don't underestimate the science of faction. For realz.