There’s a turn of phrase in Spanish. “Vestir de blanco” or “To dress all in white.” Basically, it means “putting on your Sunday best”. The outfit itself was a nod to Puerto Rican sugarcane farmers.

https://www.msn.com/en-us/music/news/bad-bunnys-super-bowl-decoded-what-halftime-meant-to-proud-puerto-ricans-like-me/ar-AA1W2RcM