From the description it appears that the form has been pointed at the wrong mesh. I suspect your character has two pairs of greaves at the same time, rather than getting them replaced.
It's unlikely the original has been corrupted, so this would have to be a mod (probably intended to just retexture). If you can find out which one, it would be relatively easy to fix in the CS, just by pointing to the correct mesh. Since male and female have separate meshes, it's also quite likely that this problem only affects one gender, so another possibility is to give your character a six-change.