I've tried using #texture # for robes before but it doesnt work, I do know though that if set in the DB, the NPC will have it.
Code:
10 Robe (advisor pattern)
11 Robe (FBR pattern)
12 Robe (ishva pattern)
13 Robe (oracle pattern)
14 Robe (kedge pattern)
15 Robe (SMR pattern)
16 Robe (plain)