I honestly don't know if this is a bug or working as intended. Any clothing item I create whether from a mod or without a mod cannot be created above decent quality. I've tested this dozens of times using various skills. If an otherwise identical recipe is used for any non clothing item, I can get higher quality items easily.
Other players I have consulted about this agree this seems to be a limitation, but I can find no mention of it in news.txt. the one exception is a forum user, Tinker, who has apparently been able to get fine quality fur clothing. They use the Linux version, but I can't imagine that would make a difference.
I mainly hoping to just find out whether this is working as intended or not.