Often the boots and bracers of the Forsworn Armor loses their fur covering and spikes and just become thin gloves and boots, this leaves anoying gaps between the character model and the armor. No problem with the body armor.

Any idea why the model changes? it does not appear to have to do with changing gear, it just happens randomly.

I just got the same problem. Happens to me when I equip the Armor Of The Old Gods, save the game and reload that save. So far the only way to get it back is when I switch the body armor for a normal Forsworn armor, save and reload. Then I get the bug again, but I can put on the first body armor again and the bug disappears. Very strange indeed.