Sunday best

US /ˈsʌn.deɪ best/
UK /ˈsʌn.deɪ best/
"Sunday best" picture
1.

mejor ropa, ropa de domingo

one's best clothes, worn for a special occasion or to church

:
She always wears her Sunday best when she goes to church.
Ella siempre usa su mejor ropa cuando va a la iglesia.
He was dressed in his Sunday best for the wedding.
Estaba vestido con su mejor ropa para la boda.