If Shein moves ahead with an initial public offering in the coming days, as it is reportedly preparing to file to do in London, it would be the largest ever for the UK financial capital, and by far the biggest in dollar terms for the fashion industry. The company reports it is growing faster, and is more profitable than Zara owner Inditex, by way of justifying a $64 billion valuation, far more than the market capitalisations of even Kering or…