Alix Galtis (31), a mother of three from Great Britain, came to shop at the Tesco chain wearing a backless tie-up shirt • To her astonishment, a security guard blocked her entry with a particularly ludicrous argument: "Another shopper might untie the shirt and leave you naked" • Only after she pulled out a sweatshirt from her workout bag was she allowed to enter - and now the chain is forced to apologize: "This should not have happened"