What would you do to solve  problem? I'm thinking a pastel or brightly colored pair of tights under a pretty, floral romper. We wear shorts and short skirts (and rompers) in the fall and winter

 you can wear tights under shorts, but that's dependable on the weather. If it's really hot then it's kind of pointless and will look a bit strange. I don't show off my arms, ever. I always wear a jacket or light pullover. I get away with it in warmer weather too because I can still wear T-shirts or really ,really light material shirts over swimmers and whatnot that are 3/4 or full sleeved. Maybe a good alternative is a knee length skirt, or a little shorter...just above the knee. That way it's still breezy and light, but you're not showing your legs really.