Chalecón is an augmentative form of chaleco (vest), built by adding the suffix -ón, which makes a word sound bigger or more prominent. It's an informal, regional term that instantly gives the vest more swagger than the plain word would.
In the line "Un ángel del infierno, de mezclilla el chalecón" (An angel from hell, denim vest), the singer uses chalecón to paint himself as a tough, stylish figure, with the oversized denim vest as part of his rugged image.
In "De Mezclilla El Chalecón," Luis R Conriquez paints a picture of a tough, self-made man who has overcome major challenges. The lyrics describe a life full of hardship and betrayal, where he learned never to back down. He sees himself as a complex figure, an "ángel del infierno" (angel from hell) who doesn't start problems but will always face them head-on, especially for his crew.
The song strongly emphasizes loyalty and a strict personal code. He rides with his crew on motorcycles, wearing his signature denim vest ("chalecón de mezclilla"), and values his trusted circle of friends—his "brothers"—above all else. He warns that money is worthless without people who have your back. Having been betrayed in the past, he now keeps his circle small and trusts only a few, proving that for him, true strength comes from loyalty, not wealth or power.