That's correct. The function that you'll need to use for this is
FOSE's http://fose.silverlock.org/fose_command_doc.html#GetEquippedObject.
If you only need to check if the player is wearing an item from a specific set (i.e. form list) of item, then you could use http://geck.gamesas.com/index.php/GetEquipped.
Cipscis