Ahahaha..
Forsworn armor, fur armor, nocturnal's robes, and ancient nord armor.
Your definition of lore friendly might be different from mine, but there are some forms of "chainmail bikinis" in TES games, and advlt themes certainly aren't new to TES.
This is unrelated to what you've said, but when people start bringing up the "chainmail bikinis ruin my immersion" and that those wearing them should take more damage, then fireballs need to spell out death, and anyone wearing plate armor should take 10x as much damage from shock spells. People wearing cloth armor shouldn't be more resistant to flames than someone wearing armor, people should die much much faster etc. Take your pick, there are more immersion breaking things out there, it's much more reasonable to say you don't want those kinds of themes in your game and leave it at that.
Then there's the whole "I don't want those kinds of advlt themes in my games" argument. It's totally fine to feel that way, and to want that in a TES game, but when people start saying that line of thinking is the only line of thinking in a TES game, or that no one even likes skimpy armor in a TES game, that's when they're wrong. Looking at the nexus, and the sheer amount of mods that are skimpy armor mods and how many downloads they have, that playerbase is absolutely massive and shouldn't be taken lightly.
With all that said, it is ZOS' game, and not Bethesda's game, they can take whatever direction they want with it. So long as people don't keep forgetting that those kinds of themes already exist and are already popular and becomes the justification for why there isn't any skimpy armor, then there won't be a problem. If it's simply a design choice and they're targeting a certain audience, that's fine. If they're trying to attract a TES audience though, saying that only TES players don't like skimpy armor would be a lie.