Key Takeaways: Most casino night parties fall under cocktail, semi-formal, or themed attire...check your invite or ask the host. Men can’t go wrong with a blazer and dress shoes; women can dress up in cocktail dresses or jumpsuits. Corporate casino parties lean business formal, while private house parties can be more relaxed. Themed casino nights (like Gatsby or Vegas) often encourage guests to dress in costume or era-specific looks. Comfort is key! Choose shoes and clothing