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The most important element of a great outfit is fit. If it doesn’t fit you, it won’t look good, no matter how nice it is. Always buy clothes that fit you in the shoulders and waist, and has sleeves and legs that are the right height for you. Don’t worry if you’re having trouble finding something perfect--you can have most clothes altered! If you’re going for black tie, you’ll need your very best clothes. Men should wear a black tuxedo with a white shirt--no ruffles, brightly-colored jackets, or flashy bow ties. You can wear a cummerbund in a darker, discreet color like burgundy, navy blue, or forest green.  You can rent a tuxedo at any formalwear store. There is also a much more formal dress code called white tie, but it’s unlikely you’ll ever see it at a casino. Formal and semiformal outfits don’t need to be as fancy as black-tie ones, but you should still make sure you look nice. Men should wear suits with ties. For semiformal, you can skip the tie, but be sure to wear a dress shirt and a blazer. If you want to wear dressy-casual or casual chic (they mean the same thing), you can be a little less formal. Men can wear khakis and dress shirts or even jeans with a sportcoat. A good guideline is to think of something you would wear to a beach wedding, someone else’s graduation, or a nice lunch outing. You will need to wear black dress shoes for formal and black-tie casinos, but you can wear other colors for semiformal and dressy-casual places. Your shoes should match the main color of your suit--black shoes for a black suit, brown for a brown suit, etc. Sneakers and flip-flops will almost never be appropriate for any casino. The only exceptions would be gaming bars and possibly beachfront casinos. Menswear doesn't accessorize much, but the casino is a great place to try something a little out of the ordinary for you. Unless the casino has a very strict black tie dress code, you can wear jewel cufflinks, bright ties, and even bolo ties and cowboy hats to most casinos. It’s always a good idea to have a backup just in case. In the time leading up to your casino outing, you might lose or damage your clothes, go through a weight change, or simply just change your mind. Keep a backup outfit handy, or at least know where you can get a quick replacement.
Look for fitted clothes. Dress for a black-tie night out. Choose a formal or semiformal suit. Wear slacks and a dress shirt for dressy-casual casinos. Pick shoes that match the formality your outfit. Choose accessories that complement your clothes. Keep a backup outfit in mind.