Preferred skirt lengths? In private and in public

Hey all! I've been a femboy for ~2 years and I've finally decided to start interacting with this community.

I was at the mall with my friend and she commented that my skirt was short and she was worried people might see my underwear when going up stairs. I told her it was fine and not to worry. It did make me curious about the opinions of other femboys.

What length skirts do you usually like wearing both in private and in public? Does it change if you're wearing a skort or shorts underneath?

Personally, I prefer going shorter and wear skirts that go to about 1-2 inches below the crotch regardless of the circumstances.