So...full disclosure time... my wiskars are porcupine hairs trimmed off or shed. 
But that is all.
What about feather suits??
Feathers can actually be harvested when a bird is molting and be done humanely. Feathers are actually an advanced kind of material because they take some skill to make if you make fake ones and if you use real ones you need to be familiar with feather patterns so it looks fairly natural. I'm all in favor of using genuine feathers for feathersuits just as long as they are harvested humanely. It's not difficult to find people online with a good reputation.
I personally have no qualms about some certain animal products being used in suit making. Leather for example is a material made from cow hide and cows are slaughtered daily for the beef industry. I can't say no to a good burger. And I think it's really wasteful to just throw away parts of an animal you kill when those parts can be used for other stuff.
PETA people are odd ducks. They want animal rights, fine, but many animals in human society are domesticated, meaning that without us they would die a slow and horrible death in the wild. Just look at the story of that sheep that escaped the farm and when he was found he had massive layers of unsheared wool all over him, covered in sticker burrs and had trouble getting around. If he had not been found and sheared he would have died miserably.

Do animals deserve respect? Of course. We need them. We can't survive without them even the vegans who preach moral superiority would be in trouble if the meat industry just vanished overnight. But we made these animals as they are, they need us as much as we need them, and I think that it would be an insult to the animal to not make use of its sacrifice.
All that said I do not like the fur trade or the fur industry because animals that are raised exclusively for fur are not treated well or humanely for the most part. They lead sad lives and I'm pretty sure most of their remains go to waste. That is not something I can condone or support.