Smart casual means neat but not formal in dress. A smart casual dress code.
It is the most argued-over instruction on any invitation, since nobody defines it the same way. Smart casual in practice means no tie and no trainers, which is as close to a rule as it gets.
1adjectivesmart casualNeat but not formal in dress.
“The invitation said smart casual and half the room wore suits.”
smart casual is a dress code.
Practised in Manners & Etiquette