all hat and no cattle

The phrase "all hat and no cattle" is an idiomatic expression commonly used in Texas and other Western regions of the United States. It refers to someone who talks boastfully or pretentiously, often wearing a large cowboy hat as a symbol of their supposed expertise, but lacking the actual experience, knowledge, or substance to back up their claims. In essence, it implies that the person is all show and no substance, exaggerating their abilities or accomplishments without any real evidence to support it.