Karabor Priest's Robes is part of the transmog set Karabor Priest's Vestments (Priest, Mage and Warlock only), which the Appearances collection lists in 2 versions. The other 9 pieces:
Blizzard numbers items as they are created, so the named items next to ID 234863 (234858 to 234868) were usually added in the same batch as Karabor Priest's Robes: the same quest line, zone, vendor or reward set.