ponerse guapo
to get dressed up; to make oneself look nice
Translation
to get dressed up; to make oneself look nice
Explanation
Prepararse o arreglarse para lucir mejor, generalmente antes de un evento especial o una ocasión importante.
Examples
Voy a ponerme guapo para la boda de mi primo.
Antes de salir de fiesta, me gusta ponerme guapo.
Memory Aid
"Put on Handsome." 'Ponerse guapo' sounds like "put on a go," meaning to get dressed up or become handsome.