Being coldblooded is all the more reason to dress up in nice warm clothing, since they aren't able to generate their own body-heat, they're dependant on external factors like the sun.
Counterintuitively clothing only really works on warmblooded creatures. Clothing keeps you warm by trapping the heat you produce. A coldblooded creature doesn't produce heat, so there's no heat for your clothing to trap.
Argonians.
*pause*
Argonians in Morrowind rather than Oblivion/Skyrim
Argonians are kind of my point. It's just humans with lizard heads.
Sure you can make them look like that. But there is very little lizard left in them. Or at least, I can't find any particularly interesting artwork.
The problem is the choice to stick with the Meso-American theme, which limits the choices of weapons, even for the skinks. Remember the days skinks had bows and arrows? But those were removed because not Meso-American enough.
How are bows not meso-american enough? Is this the tiffany problem again?
Anyways, even if we stick with meso-american, there's plenty that just hasn't been explored.
Give a 2-handed variant of their "swords", give them slings, give them axes, give them daggers to hang by their side. Those all fit with meso-american.
Also, why are seraphon limited to wood + obsidian weapons? Why aren't they use the bones/tusks/scales/horns/etc. from the various big dinosaurs? Like why isn't there a saurus that uses a sword made out of a carnosaur fang or something? Or a cavalry unit that uses stegadon horns as heavy lances? Or shields made out of bastiladon scales?
Don't get me wrong; there's still going to be a lack of variety compared to something like the vampires who have things like hair, and can wear anything from elegant clothes to heavy armour. But it's not cuz they're meso-american.
And as for armour... sure, scales offer protection, but why not add on that? Guardians were supposed to be the ultimate protectors for slann, why not stack their odds and wear a layer of armour on top of the protection their scales provide?
Saurus seem to have big heavy scales with large backspikes, that shift a bit as they move. Kroxigor have even more pronounced ridges on their back. Laying armour (or even just clothes) on top of that, and keeping it in place, without damaging things or restricting movement, would be difficult.
Though they could go the ork route of just sticking a slab of metal in random places and hoping for the best. (which in fairness, they kind of do with their shoulderplates and such)