Step 1:
This denim print paper is about 18x18 centimeters.
Fold over the three lines, start with the upper line.

Step 8:
Open the skirt from the inside.

Step 6:
Fold over these two lines.

Step 5:
Fold the corner backwards.

Step 7:
Use glue or tape

Step 3:
Make two or three folds on the upper edge, start with the upper line

Step 2:
Fold the upper edge a little off the lower edge, see arrow

Step 4:
Prefold in half.

Done!
This is a video tutorial by Joost Langeveld for folding the mini skirt:

Picture: Dollhouse shopping centre made of paper shops