You can have 2 upgrades, being a priest.
You can ask an enchanter for the +5 skinning enchant to gloves, and you can wait a couple of (more like 10) levels, and get a party to kill the beast in UBRS. It occasionally drops a dagger called Finkle's Skinner which gives +10 to skinning.
Mind you, you don't need more than 305 skinning until you can use that knife, since you won't be skinning level 62+ mobs before then.
There is also a sword in ZG called the Zulian Slicer, also with +10 to skinning, but as a priest, you can't use that.