Alacritous Armor (5e Equipment)

Armor (medium or heavy, but not hide), common

If you are wearing the armor, you can use an action to speak its command word, which causes it to doff itself, and drop harmlessly at your feet by the end of your turn.
If you are not wearing the armor but are in physical contact with it, you can use an action to speak its command word, which causes it to magically don itself onto your body by the end of your turn.