A normal horse mount

[Barraind]

I sport a lot of simple villager glams, and would very much like a basic brown horse mount to go with it

Horses are so overwhelmingly rare in the Final Fantasy multiverse that unless you're from the Azim Steppes (and even then, based on some of the quest lines, unless you're a Mol tribesman, you're not getting a horse), you probably think they're fantasy creatures, and a 'simple villager' with a horse would mean you'd clearly be a primal pretending to be a human, and burn the witch would be had by all.

Look at the current horse mounts. All of them are primals or are tied to primals/myth (Odin rides one, ixion is one, the primal cycle mounts are based in Mythology; Enbarr is the Irish god Lugh's steed, Xanthos is one of Poseidon's horses that drew Achilles' chariot in the trojan war, Gullfaxi is Thor's sons horse. Aithon is a common name for horses in greek myth [Hades, Helios and Ares had one] though the one in game is probably based on Hector's, given Trojan war connections to Xanthos . Even Nightmare is based on the Old English / Germanoslavic folkale of incubi).

The exception is the HoH horse, and its even considered to be a legend in 14's lore.

In short, you're probably not riding a horse without some kind of heroic feat.