The 6th Cavalry Regiment was designated as "Braganza", after the ruling house of Portugal.
The Portuguese cavalry had buff belts. This unit carries Carbines The Portuguese Cavalry was generally considered fairly poor. Portugal has very rugged and mountainous terrain, and was not good horse country. Most regiments were chronically understrength and had insufficient mounts even for the men who were on hand.
My original, sole regiment of Portuguese Cavalry were Minifigs (with the correct uniform details for the Portuguese cavalry, such as the red plumes on the helmets. They were absurdly overstrength at 12 figures (instead of my standard 8 figures). The officers from the Foundry command sets for the British Light Dragoons were wearing bicornes, which I didn't like at all, so they were dispatched to the "Command" ranks. Thus a couple of the Minifigs (who were also equipped with Carbines)lightly updated and added to the ranks, one serving as the standard bearer.
This regiment had red collars and cuffs with yellow piping and turnbacks.
It seems the natural leather horse furniture was also customary for the Portuguese cavalry.