My Grandmother, long departed, told a couple of stories of the Jeweller's shop she used to manage. She steered a somewhat scruffy customer towards some cheaper items with an ill-judged "these are too expensive" type comment, only to be tipped off that they were actually a rather wealthy family who were extremely valuable customers, who ended up buying the best gold watch they stocked. As a very much working class lady herself, she was by no means a snob but it was a valuable lesson in judging by appearances, and a lesson she passed on to me as a child decades later. Another tale from the same shop was someone guiding another customer on an item of slightly garish jewellery "oh no, you'll look like a barmaid"...to the inevitable response "but I am a barmaid".