strange thing; eccentric taste; red eboshi
Literally 'red eboshi' (a type of court cap), but used idiomatically to refer to something odd or an eccentric preference. The connection may come from the unusualness of a red eboshi in certain contexts. The literal sense is included for completeness but is rare in modern usage.
See also: 烏帽子
His hobby is truly eccentric.
This antique is so unusual it could be called a red eboshi.
Refers to the black lacquered cap worn by court nobles in ancient Japan. 赤烏帽子 is a red variant, used metaphorically for something strange.
Literally “red eboshi,” an eccentric choice of headgear. Its figurative use is associated with the proverb 亭主の好きな赤烏帽子, describing compliance with another person’s peculiar taste.