I really think wearing fake animal fur/skin would raise eyebrows on the first impressions on those who know you are vegan.
Wearing synthetic leather on shoes is not a big deal for me, however, since I don't consider shoes to be as showy as, say, a fake leather jacket. I actually purchased soccer cleats that were made with the fake stuff. Not a problem with me.
Fake fur, on the other hand, is more "out there" than fake leather. The first thing you notice on some hoodie jackets is the fur that lines the outside of the hood, for instance. I just personally refuse to wear something that prominent, something that highly resembles the exploitation and suffering of an animal with fur. It just wouldn't match up with my views, even if a thrift store was selling it (and I love shopping at secondhand stores).
Taking it a step further, I also think wearing fake animal furs/skins are a lot different than eating fake meat; fake meats are considered to me as either:
1) A stepping stone for new vegetarians or vegans who are slowly weaning themselves off of the real thing, or
2) As convenience foods that veg-friendly people eat for the similar taste of meat but without cholesterol, too much saturated fat, growth hormones and antibiotics.
Both of these reasons make a lot of sense but a fake fur-wearing vegan is quite questionable. The only exception I have with the faux fur is if the material is lining the inside of shoes or a durable weather jacket.
Personally, I wouldn't want to risk the public prejudice, not that we vegetarians/vegans don't get enough of that. I'd rather answer the usual, "Where do you get your protein?"
Photo credit: Joana Croft