Magnetic Ring
You see, I am a very magnetic personality...
It can be created in a Crafting Table, via shaped recipe:
Alternatively, there is a small chance to find it in most of the Overworld dungeons.
When worn in the Ring slot, it will move any dropped items within 8 blocks radius towards the wearer, leaving trail of violet particles behind them.
Dropped items will always move towards bearer of the ring in a straight line. Because of that, they will likely stuck in place if any solid blocks are in their way.
Additionally, any items affected by the ring will have their pickup cooldown set to 0, allowing to instantly pickup items thrown by other players and effectively preventing the player from throwing anything away unless they hold Shift.
If the player has their inventory full and therefore cannot pick up dropped item, Magnetic Ring will not affect it. This prevents items from annoyingly following the player when they can't or don't really want to pick up those items.