There isn't really a gathering profession that goes with this. I have a priest who is a tailor/enchanter, as you can disenchant manufactured green items into enchanting reagents.
As you seem to have the other professions covered in your alts, you could go this way - especially if your enchanter character is a cloth wearer. Then as well as collecting reagents, you can make yourself some nice items.
Alternatively, you could pick another profession and then supply your enchanter with green items from your smith or leatherworker. Plenty options - hope this helps!