Weaving

Rhynst:
Weaving actually can be raised in three ways. First, find Fae in
Arcadia, who will teach you the basics of weaving – up to 29 skill.
Then, the slow way to raise weaving further is by mending fishing
nets with fids. Otherwise, get spider silk from the freaky spider area
and weave rings out of it. There’s a possibility that weaving ability
actually makes some Drowgar spells better – those that involve
weaving, like spider armour and spider pack. When you have ample
silk, this skill goes up quickly – the problem is getting hands on the
silk in the first place – the area producing it has a maximum level
requirement.

Tinuviel's comments:
There are a couple new ways to raise this now.  You can weave the
grass from Gwot's place on Infidian into bracelets and mats and other
things.  You can also pick flowers in Gemynd to weave into circlets,
bracelets, and cloaks.