Locking and Unlocking Equipment Tabs

If you don't want to accidentally un-equip certain items from your character, you can choose to lock certain equipped items in your "Wear" window.

Right-click and hold on an equipped item in your "Wear" window and select "Lock Item" to lock that item into the current slot. Note: you cannot lock empty slots.
A "lock" icon will appear in the bottom-right corner of that equipment slot and you will not be able to un-equip the item until you unlock it first.
To unlock all your locked items, click the "i" icon at the top-left of your "Wear" window and select "Unlock All Items."

You can also lock all equipment tabs by pressing F10, clicking "GUI>Equipment Window," and selecting "Lock equipment tabs." This will not display a lock icon on your equipment slots. If you lock slots this way, just un-check "Lock equipment tabs" to unlock your equipment slots.