Cloaks from Queen's Conservatory sets, Court of Night reputation sets and Venthyr's Mirrors share transmog models for any type of armor as well as cloaks from Necrolord Aboms and from Path of Ascension. ATT knows about the latest but not about the first.

@ImUnicke

Sadge
I was recently browsing the collection and noticed that I don't have models in the collection although they have been learned. Wowhead told me that these were from alliance quests, so I had to get Horde variants :|
Also there are capes from SL covenant features and capes from The Seat of the Triumvirate sets questline also

Yea this was reported on the Discord #errors a while back... not really sure we have a good way to distinguish some of this since the NF cloaks are part of Ensembles which are only purchasable by certain Classes. So we'd need to list the Cloaks specifically outside of the Ensembles so they don't filter and put a note that they come from Ensembles...
The others I looked at also and didn't immediately see a good solution to break them apart so they would be visible on usable Classes, so until someone gets to look into that again, it will stay how it is.

There's other situations as well where something is usable but will be filtered due to the methods of acquisition being restricted... like faction appearances from opposite faction quests in BFA. Unfortunately no good solution to that at this time.

I think the current concept of trying to show an unfiltered Thing (e.g. Cloak) which is sourced within a filtered Thing (e.g. Class-locked Ensemble) is a bit against the scope of ATT's purpose and filtering.

If there's a Cloak from an Ensemble that the current character has no capability of obtaining, we'd prefer to NOT show that Cloak if the current settings prevent it. (I know there are various caveats to this currently)

In the case that a user finds an appearance in the wardrobe and specifically wants to find that appearance in ATT, it is possible to /att [Appearance Link] to bring up a popout window to see how it is obtained. Alternatively, if one is specifically trying to find Cloaks (or another equipment slot) the /att filters window viewed in Account Mode may provide a decent overview as well since it will bypass group-based filtering:
(On a Night Fae Paladin)

Hopefully this could be considered a viable alternative to the request.