Sports jacket and jeans – If you prefer a more casual look, a sports jacket and jeans are a great option.You can add a pop of color with a patterned tie or pocket square. Choose a well-fitted suit in a neutral color like black, grey, or navy. Suit – If you want to go all out, wear a suit to your Vegas themed party.Finish the look with a pair of dress shoes. Choose a crisp, white shirt and pair it with black or navy slacks. Dress shirt and slacks – A classic dress shirt and slacks combination is perfect for a Vegas themed party.