Lejuan
Super Freak
A hair suit involves millions of micron sized fibres, even if man-made. Gillie suits have far thicker, far fewer component strands.
Hair has to lie down in just a certain way to look realistic. The subtle highlights of hair are hard to capture in an artificial fibre.
A replica also has to capture that subtle short hair to long transition from around the mouth and nose. We can barely make realistic human doll hair, when the real thing is relatively uniform and comes to an abrupt end at the forehead.
Gillie suits in contrast can pretty much be a random mess because that is what they are supposed to replicate.
I think a real hair Chewbacca would be fanatastic as an ideal, But creative use of rubber at the joints of a sculpted Chewie is a lot more realistic.
That's too bad. So the only way 'fur' could work is to punch it directly into the plastic... and even that would fall short of providing a convincing Wookie do. I'm very happy with Sparrow's dreads... if this effect could be convincingly applied throughout an entire body it could look good I guess. The issue would then be not how well it holds up as a stand-alone piece but how well it fits with the figures around it.