I will post some bits and pieces of stuff that I find online...
Casinos often go out of their way to respect the superstitious beliefs of their patrons. For example, the MGM Grand Hotel and Casino in Las Vegas underwent a major renovation in 1998, partly to conform to the beliefs of Asian gamblers who believed that walking through the mouth of a lion is unlucky. The MGM Grand at that time has an entrance in the shape of a lion's mouth.
It was believed that wearing a piece of dirty clothing will shoo away bad luck. Also, you should not cross your legs so that you will not “cross out of luck.”
- best known superstitious belief is the wearing of red-colored clothing. Red is supposed to be the color of good luck.