How to Glamour a Piece of Armor?

[Anova]

Ok, that helps quite a bit! But just so I'm clear: I go by the iLevel of the item I want to be glamoured (as in the one that will be shown) correct? Or do I go by the iLevel of the piece that the new equipment will be going OVER?

You go by the ilvl of the cosmetic piece (one you want to be shown). So, if you wanted to turn your magician robe in to the Evoker, you'd use the grade 3 prism. If you wanted the appearance of an i15 acolyte robe, it would be a grade 1 prism.