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>But the expensive ones are all rigid and starchy and at worst, polyester.
Not all of them. I've got a Nike track suit which was 100 quid, which is arguably in the upper price range for track suits. It's polyester; you will find that track suits are rarely made of other materials, unless they're actually sweat suits. But it's very comfortable, because it's kind of a soft and light polyester.
>I mean, when did tracksuits become a thing? Surely any pensioner was well into their thirties when the fashion propagated. So they have made the choice to start wearing the fashionable yooth clothes at middle age?
Look at many 50-year-olds today, and you will find that some of them wear the same kind of fashion as 25-year-olds. Brand name printed sweaters or T-shirts, jeans, denim or leather jackets, maybe even a hoodie underneath. And why not. I think it's refreshing that middle aged people nowadays don't wear tweed coats, horn rimmed spectacles and Fedora hats anymore. It doesn't necessarily mean you're clinging to your lost youth. Times have moved on. Yesterday's youth rebels are today's middle aged adults. The same way that you now have septuagenarians who have been lifelong fans of The Who, or people in their early 60s who used to be punks in the mid to late 1970s. They didn't suddenly forget about all that just because they crossed the middle age threshold.