I hope there is the chance to wear clothing beneath armour again. And robes over armour.
I'd say that being able to wear clothing under armor again would seriously unbalance the game against unarmored characters, I mean, they sacrifice the additional protection of armor and ALSO get stuck with less enchantment slots, so I can't say I really miss being able to wear clothes under armor. Admitably, Oblivion still penalized unarmored characters by removing the unarmored skill (Which didn't work properly in Morrowind anyway, but that's a problem that can be avoided with no gameplay mechanics.) and making the frankly baffling decision to not unclude any non-armored gloves except for the wrist items, and making robes, you know, the things mages, one of the character types you might consider playing without armor, take up both the pants and shirts slot, at the very least, some even came with built in gloves and shoes as well, considerably reducing the amount of enchantment slots available to players who used them, but those are issues that can be fixed in future games, and I'd say that robes should be able to be worn over both armor and clothing. Now, I have, in the past, made characters in the Elder Scrolls that are not necessarily the most powerful, but not everyone wants to do that. And the general ideal design for an RPG is to make all character types balanced and viable, obviously, this isn't to say they should be identical, but it's usually not a good idea to intentionally design the game in a way that ends up crippling certain character types. If it is indeed possible to wear armor over clothing, than going unarmored will need a pretty big advantage to make up for the sacrifice of extra protection AND many extra enchantment slots.
I would say, however, that seperate pauldrons and gloves/gauntlets should return, as well as some kind of non-armored item that fulfills the role of pauldrons for unarmored characters, probably. I also wouldn't mind seeing belts return, and like the jewelry in Oblivion, they should be visible on your character when worn. Other than that, I hope to see cloaks and capes this time around, the best effect with these could be achieved if the game had clothing physics, but honestly, even if items like this were completely stiff like most of the ones in Oblivion and Morrowind mods, I'd still want them in the game. O also hope we see some hats this time around, I like that Bethesda added hoods in Oblivion, but why should those be the only head gear that is not armored in the game? If I'm going to go around without the protection of armor, I want to do it in style, I want to see hats and other varieties of headgear, both plain and fancy. Also, I hope that this time around, skirts are separate items from pants, like they were in Morrowind, as opposed to being like Oblivion where pants become skirts when worn by female characters. If my male characters want to wear skirts, that should be their right. That might sound strange, I know, but it's true.