There are a couple you can apply yourself:
Agility/Strength Users
Clefthide Leg Armour
4 Stamina 3 Agility @ 59
Cobrahide Leg Armour
4 Attack Power 3 Crit @ 59
Intellect Users
Mystical Spellthread
5 Stamina 5 Intellect @ 59
Silver Spellthread
5 Stamina 5 Intellect @ 59
You can enchant gear through a small exploit explained on the video below:
For this you will need someone at a high enough level for the enchant to be in the group with you when the item drops. Then you can abuse the trade option to get whatever leg enchant you want.
Are any of the higher leg enchants worth it? I haven't done much research.
Also this method is exploiting a feature of the game and it runs the risk of binding to the higher level, not yourself.
I'll have a look at the other leg enchants and see if any scale better to a 59 as this could potentially be BIS
EDIT:
These seem to offer better/alternative stats which may be worth the effort if you don't mind investing heaps of time into it:
Brilliant Spellthread
5 Intellect 5 Versatility @ 59
Sapphire Spellthread
7 Spellpower 5 Stamina @ 59
Angerhide Leg Armour
8 Strength 5 Stamina @ 59
Shadowleather Leg Armour
8 Agility 5 Stamina @ 59
Nerubian Leg Armour
5 Attack Power 3 Critical Strike @ 59