Putting armor on manually or with a command triggers the Sculk Sensor.

However, running a command like 

/item replace entity @p armor.chest from entity @p armor.head 

without wearing any armor

or 

/item replace entity @p armor.chest with air 

 still triggers the Sensor, despite the output being that the slot was replaced with air and not armor. No sound plays for the air "equipping" event.

Replaced a slot on <name> with [Air]