Berinor |
Pathfinder Adventure Path, Rulebook, Starfinder Adventure Path, Starfinder Roleplaying Game Subscriber
Taking them off your belt is retrieve a stored action (move action). A brief search didn't get me to a direct rules reference, but donning a regular magic item that doesn't have other baggage (so not armor, for example) is typically also a move action.
So two move actions, which could be taken in separate rounds or a move action and a standard-as-move action.