Depending on which area you are going at Marina Bay Sands in Singapore, there may or may not be a dress code. The dress policy for the casino and some bars and restaurants is "smart casual," which means that visitors are expected to dress formally and refrain from donning things like slippers, shorts, and sleeveless shirts. However, there are some sections of the resort, like the rooftop bars and some of the outdoor spaces, where the dress code is more lax. To make sure you are dressed appropriately, it is always a good idea to verify the specific dress code requirements for the location you plan to visit.