Sunday best

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

niedzielne ubranie, najlepsze ubranie

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

:
She always wears her Sunday best when she goes to church.
Zawsze nosi swoje niedzielne ubranie, gdy idzie do kościoła.
He was dressed in his Sunday best for the wedding.
Był ubrany w swoje niedzielne ubranie na wesele.