You can totally use top head, but there will need to be something floating above or on the avatars head added to the wearable. If you check the most recent wing submissions you’ll see this is now the standard -
The reason for this is to ensure we don’t have mis-represented wearables in slots. Since all the meta data is on the blockchain we can’t adjust these categories after the fact. It will mostly likely be required until there’s an official ‘wing’ slot.