What is the origin of the idiom "off the cuff" and when to use it?

The idiom "off the cuff" originates from the world of clothing and refers to something that is done or said spontaneously or without prior preparation. The phrase is linked to the practice of making impromptu notes or remarks on the cuffs of one's shirt or jacket, as opposed to a prepared speech or script. "Off the cuff" is used to describe informal, unrehearsed, and spontaneous actions or comments.