Yeah this is a bit awkward. Inform basically considers the player character (in game) and the player (sitting at the keyboard) as the same person by default. So the game tells you: “You are holding your sword”, and you might tell the game “I would like to put my sword down”, or whatever.
In my game, I manually ensured that the player could use both “your” and “my” to refer to things conceptionally owned by the PC, e.g.:
The armor is wearable and proper-named. The printed name is "your armor".
Understand "your/my/-- battle/combat/-- armor/armour/rattle" or "your/my/-- suit/set of/-- battle/combat/-- armor/armour" or "suit" as the armor.
(There’s probably a more general way to accomplish this that I never bothered to research, but this works well enough.)