This would be one of the biggest QoL changes to hit the game since launch, and by looking at the design of the Outfit Designer, it isn't very far-fetched. There are tabs that allow you to swap between outfits on demand, without having any of the actual items in your inventory. More tabs can be purchased with credits, thus allowing you to equip more sets of outfits at a single time.
We NEED this exact mechanic, but with actual STAT GEAR. I should be able to pull up the creation menu and tab between gear sets just as with outfits, and not be forced to carry around a PVE DPS set, PVE Tank set, PVP DPS set, and PVP Tank set just to save a trip to the cargo bay every time I change gears. This is a change that I'm sure has been mentioned since day 1, but with the way the outfit designer works and the amount of quality it would bring in comparison to seemingly more complicated measures, my question is, why not now?