I remember when belly shirts were the coolest thing during the Britney Spears, teen-age/middle school era. Over time, however, it became less and less acceptable to show some skin and more along the lines of just plain trashy. As long as you have the body, I have always found it completely acceptable to show some skin, but only in a cute "I am an innocent farmer girl, watch me milk my cows" kind of way. Tied up shirts are becoming trendy again anyways! The only thing that matters when wearing short shorts and tied up shirts is that you are doing it in a classy and tasteful way! Live a little, your not going to have soft baby skin forever.