I agree, not a hard dress code to abide by. Casual pants or jeans and a shirt with a collar (polo etc) are pretty easy to follow. We did run into a couple on our last cruise (HAL) that unfortunately did not have their luggage make it with them (maybe the 4th night it caught up?) - they told us they were on a transfer from the airport to the ship via HAL and all the people on the bus - 30-40 of them, had their luggage left behind. so they were given a tshirt and a few other things, but only had their casual clothes. So if you do see someone in the MDR that is dressed very casual, it could potentially be a case that their luggage has not caught up with them yet. Yes I realize this would be an extremely small percentage - but just something to consider.