business suit
US /ˈbɪz.nɪs ˌsuːt/
UK /ˈbɪz.nɪs ˌsuːt/

1.
a set of matching clothes consisting of a jacket and trousers or a skirt, worn for formal or professional occasions
:
•
He wore a sharp business suit to the interview.
•
Many professionals are required to wear a business suit daily.