I've noticed people jumping into pool with shirts, tanktops, shorts or jeans and security consistently have to ask them to remove tank tops and wear swimming suit instead of jeans. Hotel had been pleading this rules over and over several times for sake of sanitary purpose ask them to remove the top and wear proper swiming suits. I don't know if it really is unsanitary or perhaps tripadvisor reviews tip the upper hotel staff off. But it got to be little annoying after hearing same announcements over and over and I am not so found of pool dress code police monitoring...