Costume Closet
This artifact enters with two +1/+1 counters on it. {T}: Move a +1/+1 counter from this artifact onto target creature you control. Activate only as a sorcery. Whenever a modified creature you control leaves the battlefield, put a +1/+1 counter on this artifact. (Equipment, Auras you control, and counters are modifications.)
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Official rulings (6) · Scryfall
If Costume Closet has left the battlefield or has no +1/+1 counters on it by the time its activated ability resolves, you won't put a +1/+1 counter on the target creature. If the creature becomes an illegal target or can't have a +1/+1 counter put onto it for some other reason, you won't remove a +1/+1 counter from Costume Closet.
An Aura controlled by an opponent does not cause a creature you control to be modified.
A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
Once Costume Closet runs out of +1/+1 counters, it remains on the battlefield. However, activating its second ability won't do anything.
The +1/+1 counters on Costume Closet won't affect it unless it somehow becomes a creature.
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.