What is the dress code for a casino? At least where I live, and in most places in western society, there is no "dress code" for casinos. People come in casually with t-shirts and jeans, shorts, even businessmen go and they wear suits.
However, there are some things to keep in mind. First, casinos are usually pretty dressy places, so you'll want to avoid anything too wrinkled or stained. Second, while there's no dress code per se, it's generally frowned upon to wear athletic gear like sweatpants or tank tops.