I'll admit up front that this is really a "hide slots" thread in disguise, but the current situation also needs an answer.
Nadja the Naked Nord here just got the chance to hide her weapon, when the Gloambound Arms Pack came back to the Store. She was using "Hide Helmet" and "Hide waist" (a.k.a. Orc Belt 1) already, with the minimal Ancient Elf Gloves and Soul Shriven Sandals, but still has to forgo the chest, legs and shoulder slots.

Currently she uses the Ring of the Pale Order, five pieces of Mother's Sorrow, and three of Julianos. What would be upgrades for any of that without filling those three slots?