shlishi: It doesn’t look like you’re female. You’ll never understand the great nisayon of dressing according to the style. As a girl, I can say that yes, it IS TERRIBLY DIFFICULT!!! I too wear straight skirts – cuz EVERYONE does. I did stop wearing one favorite skirt that was too tight, but I still wear them. So please don’t just say, “don’t wear them”. You can wear tzniusdik straight skirts too.
Pumper: I pull my skirt down while entering/exiting a car. Or cover it with a bag/pocket book as aries suggested.