Idk if here is the right place to put it so if there is a better place, pls do lmk.
In Fantasy, lots of the stories have some poor person pretending to be a rich person or some rich person pretending to be a poor person. Usually for long periods of time, ie they are undercover or something. If there is any "plot" around it, it normally is very superficial i.e. poor person says "I was poor and I never had all these forks and stuff, which one will I use?" or rich person says "I was rich and I didn't know how poor these poor people are" and then it is completely brushed over.
I was thinking, in our real world (lots of fantasy is set in a medieval like world but let us focus on our present day since we won't have to be historians as well), how hard would it be for an individual to pretend to be in a class in which they are not.
I was thinking that in our modern time period, accents would be a huge thing which would be hard to fake for a long period of time. I am an American but I know what the "pop culture" rich British person's accent sounds like and what the "pop culture" poor British person's accent sounds like but I do not know if it is "really" their accents. Americans do not really have a rich person accent (in pop culture?) but there is a few poor person accents/ speech mannerism.
Anther thing might be jargon. I am a network engineer and there is jargon that people of my profession use that outsiders do not use correctly, that I would be able to somewhat tell by speaking to them. I do not know if this would apply to the different classes, i.e. rich people talking about their polo horses and yachts and poor people talking about whatever they talk about.