During the 1930s shoes made of two tones of leather, one light, one dark, and worn by both men and women, were known as "divorce court" or "co-respondent" shoes. It was well known that Wallis Simpson wore them but it would have been considered extremely daring for a middle class British girl to do the same. Mrs R., an MP's daughter from Gloucestershire, remembers
"two-coloured shoes, you know, they were known as co-respondent shoes, everyone knew that. I mean you wouldn't dream of them. Or if you did, you were not quite our class dear, which was, NQOCD. Isn't that awful? That was said sometimes."
From: Keeping Up Appearances: Fashion and Class Between The Wars by Catherine Horwood.