This is just stereotypical nonsense, I know quite a few old money and I can assure you they dress very well. Real life is not a jilly cooper novel.
if anything, and I will make my own stereo type, and that is those who are not actually wealthy, just not skint, maybe straddling the line between working class and lower middle, want to show it off. Those who are actually wealthy usually do not show it off, irrelevant if they earned it themselves or its generational.
as said, up thread, I earned it myself, you’d likely make an assumption if you knew me, due to where I live and how I dress, the car I drive, the privately educated child. But I’ve never ever showed it off, neither has my husband, nor would we ever consider it. So as we earned it ourselves and it’s not generational. We would be classed as nouveau riche. Everyone I know in my bracket is similar. We also live close to old money, our neighbours, in multi million pound houses. They also don’t show it off. But neither do they walk about in hand me down clothing, they are very well dressed indeed, and their homes beautiful, but they are also high earners in their own right.
if I had to make a stereotypical assumption, it’s the op is far from what most people would consider remotely wealthy.. Shes simply not in that bracket, She’s just got enough disposable income to buy some nice things, maybe a nice car on a loan repayment, house on a new build estate, can afford a decent but not extravagent holiday, but it feels wealthy to her, compared to what she’s used to, and she wants to show off she’s no longer in the poor bracket.
so my stereotype is she’s not remotely wealthy, by most people’s standards. She’s just done better than her up bringing, of which she felt ashamed, and now she can afford a few nice bits she wants to spend on them and show off.