too big for your breeches

The phrase "too big for your breeches" is an idiomatic expression that means someone is behaving in an arrogant, conceited, or overconfident manner beyond what is justified or appropriate for their abilities or position. It suggests that the person's opinion of themselves or their capabilities is inflated, often resulting in them acting superior or displaying a sense of entitlement. The term "breeches" refers to knee-length trousers, commonly worn in the past, particularly associated with an upper-class or self-important image, hence the phrase indicating inflated self-importance.