Throwing my 2 cents in, just got off the Solstice about 2 weeks ago and honestly went to the MDR once for dinner (I like food and small portions are not my game lol) and wore a long button down dress shirt, a pair of black capris that I also was using for shore excursions so they were light weight and worked w about anything (both from Shien for about $25ish USD total if that) and my Air Jordans and no one batted an eye. I don't do dresses/skirts so that was 100% not going to happen lol. I also sat at a table in Sushi on 5 in shorts, a long tank top covering my swim suit and a pair of Teva sandles for a take away order and no one batted an eye then either and had dinner there in a tank top and capris w a cardigan and no one said anything. As far as other people I saw anywhere from khaki shorts, to dark jeans, to wrap around skirts (a lot from our Thailand stop) to skorts in the MDR. Wear whats comfortable to you, maybe not sweats or your PJs lmao but as long as you don't look like you rolled out of bed or from a lounge chair on the deck I don't think they are going to be pushy about a suggested dress code. Just my opinion though :c)