Wiktionary
brothel creeper
n. (context dated English) A type of soft shoe with a crepe sole
Wikipedia
Brothel creeper
Brothel creepers (sometimes shortened to creepers) are a style of shoe which has thick crepe soles, often in combination with suede uppers. This style of footwear became fashionable in the years following World War II, seeing resurgences of popularity at various times ever since.