What's described isn't a dress code, it's 'not being a chav', essentially. It's necessary, but not sufficient, for something very far from 'upper class'.
What she described was actually very vague, so I don't know what you are envisioning?
A thing to remember though is that the further away from a social class you are, the less you know about its culture. I suspect that the styling cues she's talking about would be instantly noticeable to other people from the same class, whereas lowly plebs like you and me would never notice, or care.
A thing to remember though is that the further away from a social class you are, the less you know about its culture. I suspect that the styling cues she's talking about would be instantly noticeable to other people from the same class, whereas lowly plebs like you and me would never notice, or care.