Step 1:
Glue two squares together or fold a large square in half.
Prefold over the centerline, then fold the edges to the prefolded centerline.

Step 8:
Press this part flat again

Step 6:
Glue the edges on the upper part together, see marked area as example.

Step 11:
Fold these two parts inwards (Make the same two folds on the backside, mirror wise).

Step 10:
Fold these two parts inwards (Make the same two folds on the backside, mirror wise).

Step 9:
Glue both ends together

Step 5:
Fold all prefolded lines to the left.

Step 7:
Pull these edges upwards.

Step 3:
Prefold both lines into the same direction as the other prefolded lines.

Step 2:
Fold both edges to the centerline.
Then unfold the model.

Step 4:
Fold over these two lines.

Step 12:
Pull the hem outwards

Done!

Picture: Dollhouse office made out of paper and Origami models

And these are two 'real' frill hem pencil skirts.