Big Rich, I totally get what you feel toward your sister-in-law, it's like an on-off switch for some people. I remember when my second wife hated my closet full of black T shirts, I agreed that I needed to get different colors of Harley shirts.......LOL
Seriously isn't it great that here in the good ol US of A we are all allowed to be individuals ? I refuse to advertise for any company............but I do look for the unusually cool stuff depicting my brand of choice from differing areas that I visit.
The clothing that I buy is usually pretty unique, my wife has owned a silkscreen and embroidery business for over twenty years. Many times she will design and print event shirts for her and I and a few friends, and they are far more killer than what I could buy at the event. I don't try to impress or intimidate anyone by how I dress, I just do my own thing, hell I even own and enjoy a Ford Racing leather jacket ! Yes, Ford is also one of my brands of choice...........my choice, not anybody elses, it is what makes the world go around, and just so you know, I like any brand of automobile, if it strikes my fancy.
We all have different ideas of what we like, but, here is where the cool part comes in, we can appreciate what someone else thinks is great, even if it isn't what we would do.