él desabrochó

Después me desabrochó la blusa.

Then he unbuttoned my blouse.

— El conformista (1971)

Se desabrochó los pantalones.

He unbuttoned his pants.

Ella no notó que uno de sus botones se desabrochó.

She didn't notice that one of her buttons had come undone.

Se desabrochó el pantalón diciendo siempre que aquello no era malo.

He unbuttoned his pants, always saying that there was nothing wrong with it.

— Volver (2006)

Tom se desabrochó su chaqueta.

Tom unbuttoned his jacket.