Yeah, wearing something nice to the local pub is not, in its self, self aggrandization. Wearing the things you like, is just that, wearing things you like. Now, if you make it a point show-off that you are wearing designer brands, talk about not wanting to look poor, making remarks, like these poppy cutters, to people for having a more budget conscious wardrobe, etc. then you are self aggrandizing.

If you are simply wearing nice clothes to day-to-day stuff, and otherwise acting normally, you are just wearing things that make you happy. The people who are “cutting the tall poppies” are just doing to you, what fashion snobs would do to them. They even have similarly lame excuses “What? I am just pointing out what people could be doing to look better, which makes people treat you better, and makes you happier” vs “What? I am just pointing out that this person is being a pompous ass, which makes people think worse of them, and that they could fit in better, which will make people treat them better”.