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

1.
Smart Casual, elegant leger
a dress code that is neat, conventional, and relatively informal, typically for a workplace or social event
:
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The invitation specified smart casual attire.
Die Einladung sah Smart Casual Kleidung vor.
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For the office party, the dress code is smart casual.
Für die Büroparty ist der Dresscode Smart Casual.