Because it’s easier for manufacterers: they can create their own sizes. And that way they create customer loyalty / binding: a customer knows size X of brand Y always fits.
Furthermore, there is size vanity because customers are getting … “larger”.
The EU has tried to standardize clothing sizes, but did not succeed.
See [https://fashionunited.nl/v1/columns/de-maat-is-vol/201007159049](https://fashionunited.nl/v1/columns/de-maat-is-vol/201007159049)
Having said that: there are standards for clothing sizes:
34×36 inch for my jeans
285M (length in mm) for military boots, ski boots and my Adidas sneakers (at “China size”)
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