Click on the MERC tab on your inventory. You get four slots to insert items for your merc: waist, shoulders, ear and neck. No idea why limited to those 4 and the default images used for the slots are nothing like what you can put IN the slot.
Funny how the base stats for mercs are packed high for AGI. I guess so that's so they can avoid getting whacked. Or is it to make it easier for them to run like hell when they bail?
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Sippin 115 DRU **** Firiona Vie ****Agnarr
FV: 115 WAR ENC CLE MAG WIZ SHD SHM Master Alchemist ROG Master Tinkerer & Poison-Maker
Master Artisan (300+) * Baker * Brewer * Fletcher * Jeweler * Potter * Researcher * Smith * Tailor
Agnarr: 65 DRU ENC SHD MAG CLE ROG WIZ BRD WAR