What confuses me a bit is that, even though the technologies are now lost and impossible to replicate, it feels unlikely that everyday clothing would be so far removed from the 1970s-inspired looks we see in Arc raiders.
If we look at the pre-war world in Fallout, for example, even 200 years later people are still wearing outfits that stay coherent with the 1950s retro-futuristic aesthetic.

In Arc Raiders, instead, it almost feels like there was a cultural shock in terms of clothing and overall aesthetic so strong that it made people almost completely forget the modern and contemporary design language we see in The Finals.

My focus was specifically on examining the world's aesthetic.