Clothing retail is one of those industries where it’s hard to make more than a couple of per cent of margin.  That means clothes retailers have to be on the main street. They can’t save money by setting up in cheaper locations. Expensive locations drag down clothes retailers’ profit margins, but they push up footfall. The idea is that retailers make up for low margins on volume.  That’s because people usually don’t go out of their way to buy clothes. They dander along the main street and they browse. The model works well enough in normal times. But Covid-19 is…