It's funny how the sound is so jolly and danceable and it's about a guy that was dumped by a girl he met at the bar and apparently she had idea it was one time thing and the guy can't accept it. Camisa negra literally means black shirt that he is wearing but also referes to him feeling down
The lyrics explain that the bitter singer is wearing La Camisa Negra, the black shirt, as a way of mourning a failed love affair or even his own death, presumably singing to the object of his love. A song in Spanish from a Colombian writer. I prefer wearing white shirts.