She was wearing a black dress (so far, not so bad) and a purple hat - a bit like a top hat. The purple was the shade of the hazelnut in caramel Quality Streets. On her feet she was wearing a pair of purple crocs. Here is a picture of crocs for anyone who (sensibly in my opinion) has allowed this trend to pass them by.
I'm sure someone will tell me how practical and comfortable they are ("Great for your holidays!" as no doubt somebody's mother would say). But they are an ugly, crudely moulded lump of plastic and have no place on your feet at the bottom of an elegant little black dress. And I did check, she wasn't carrying a bag large enough to contain another pair of shoes to change into and considering how well they matched the hat, it was definitely intentional. And it was definitely very wrong.