I think its really however your parents raised you, nothing to do with class really as my cousin is doing very well for himself and was brought up to do the same thing.
The English class system (which despite protestations to the contrary is not unique; many many places have similar stratifications or broad divisions of society which are reflected culturally) is precisely about the prevailing cultural norms you were brought up in, and not really to do with doing well for yourself or otherwise (at least, not within a single generation). I think it's interesting to see how certain cultural traditions tend to clump with other cultural traditions in a way that remains down the generations despite whatever job changes might happen e.g. a shop foreman and a textile factory worker have three sons, who become a sailor, a doctor, and a salesman. All very different jobs with different cultural expectations and effects on lifestyle.
But those three men still have lots of behaviours and preferences in common that link them with anyone originating from that particular social grouping of manual and skilled artisan labourers in a northern industrial town. But that then gets modified by who each of them marries, too, so you get a mingling of cultures. My dad is one of those three sons and so part of my family's Christmas traditions reflect that background. My mum comes from a family where sons were sent to Rugby, not through being upper class but by being successful merchants, which is another social category which tends to be linked with certain traditions.
So do we have a star on our tree, or a fairy (angel?)? Tinsel, baubles that go back decades or a new set each year, lametta, Quality Street threaded on a string? These things do signify social class and neither the star not the fairy is better than the other. To pretend that none of this exists would be to ignore my families' cultural traditions.
New signifiers are brought in all the time. Christmas lights, for example: blue vs. ice white vs. warm white vs. multicoloured vs. twinkling vs. frantically flashing. There's maybe a fish-knife thing going on here (the idea that people with fish-knives in their cutlery sets were nouveau riche because inherited sets didn't have them) - having whatever the currently-fashionable colour is on trees in Harper's, or whatever, says one thing, having a style of lights that hasn't existed for twenty years says another (and having actual fucking candles that are actually on fire on your tree says you're my German relatives). It's all meaningless in terms of "better" and "worse", but lovely to feel connected with Your People by having some of the same cultural tastes and preferences.