There are a few pieces of equipment that change possible Accessory slots as they are upgraded. One in particular that I've noticed is the Azure Guardian Helm. What happens if a Mighty Cobalt helm with Glasses or something of the sort is upgraded to 5 stars, without removing the Accessory, via Bechamel?
Is the Accessory deleted? (most likely)
I'm just wondering, since I've never had the chance to actually try this.
Yeah, it gets deleted. See http://wiki.spiralknights.com/Accessory