How to Glamour a Piece of Armor?

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Glamour prisms are actually crafted and separated by grade with various level ranges. You have probably obtained a "clear prism" from a quest, which is actually a crafting material for glamour prisms. To make a usable glamour prism, you need to have the appropriate Lv.50 crafter and the Master recipe (obtained in Revenant Toll).

You can also buy the crafted glamour prism simply by using the marketboard. Simply search for "Grade x glamour" (where x is the number you want). Mousing over the items will reveal the ilvl range of the prism. For your evoker's robe, you will use a grade 3 glamour prism (clothcraft), ranged 41-60.

Here's a database for you to refer to if you're confused about other items.

Be aware that glamour prisms have a significant mark-up on the marketboard. It honestly costs 300-500 gil to make them, but they sell for 6k or more. On the other hand, you may not want to take the time to level all your crafters to 50 just to make them. If you can, try to find a crafter friend you can bring the mats to instead.