Adventure Girl wore a skort all the way up Diablo last week. Ain't nobody going to call her anything but a serious cyclist!
I personally prefer to get a wrap skirt (like the Terry Wrapper) and put it on when I need to be more presentable. The flapping of the skirt drives me nuts on the bike. The Terry wrapper is very light weight supplex so takes up very little room in a bag or pocket. This also means you can wear the wrapper just as a skirt without the bike shorts.
If you do decide on a skort, be sure to try them on. I personally find that the outer skirt is always too small for attached bike short. Once again, the Terry Wrapper lets me get the right fit for both layers and use the short/chamois of my choice.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.