....but what if you made a Heavy Armor character? Or one who wasn't a Smith? (i.e, why are you looking at it from the standpoint of "must use only the most meta-game effective?")
Seriously, don't you decide ahead of time what style of character you're making?
Again, the "street clothes = power armor" thing came about via hyperbole as the thread progressed. The OP was asking if the layered armor system (plus crafting) would allow a lesser armor type to be effective longer. Not "a t-shirt" being as strong as "power armor".
For example.
(Just like I said that Skyrim's crafting let early-game armors be "good enough" to play at high level. Not "best". Honestly, I've rarely ended up with "best" in my gear in RPGs. As long as it lets me get by, that's fine. Doesn't have to be overpowering or invulnerable. Ditto with weapons... my first Skyrim character was able to use Smithing to keep using Dawnbreaker for about thirty levels, up into the 50's. Which was great! Loved that sword. Of course, it still only had a listed damage of ~105 on my equipment screen. I was never one of the people running around with 500+ damage weapons, or 30x sneak attack multipliers, that's just not my scene.)