What is the origin of the idiom "an iron hand in a velvet glove" and when to use it?

The idiom "an iron hand in a velvet glove" has its origins in the broader history of idiomatic expressions and imagery. It likens a person's demeanor or leadership style to wearing a soft and gentle exterior (the velvet glove) while concealing a firm, strong, or stubborn nature (the iron hand) underneath. This expression is used to convey the concept of being gentle and understanding on the surface while maintaining inner resolve and assertiveness, particularly when making difficult decisions or managing situations effectively.