smart casual
US /ˌsmɑːrt ˈkæʒ.u.əl/
UK /ˌsmɑːrt ˈkæʒ.u.əl/

1.
smart casual, nette casual kleding
a dress code that is neat, conventional, and relatively informal, typically for a workplace or social event
:
•
The invitation specified smart casual attire.
De uitnodiging vermeldde smart casual kleding.
•
For the office party, the dress code is smart casual.
Voor het kantoorfeest is de dresscode smart casual.