unbuttoned
Il a déboutonné ma blouse.
He unbuttoned my blouse.
— Le Conformiste (1971)
Tom a déboutonné sa veste.
Tom unbuttoned his jacket.
Il a déboutonné son pantalon.
He unbuttoned his pants.
— Volver (2006)
Tu ne t'es pas déboutonné !
You didn't unbutton yourself!
— Amarcord (1973)
Il a déboutonné sa chemise.
He unbuttoned his shirt.