Step 1:
The mannequin paper is about 20x30 centimetres and the stand paper is 20x20 centimetres.
Fold over these 3 lines, all three parts are the same size.
 

Step 6:
Fold this corner to the left. The light purple part of the long line goes below the upper paper layer.

Step 5:
Prefold over both lines

Step 2:
Fold over these two lines. The light purple line is on the layer below the upper layer.

Step 4:
Prefold to the centerline, see arrow.

Step 3:
Prefold in half over both lines

Step 10:
Make the same folds on the backside.

Step 8:
Repeat step 6 and 7 on the left.

Step 9:
Fold over these three lines.

Step 7:
Fold the tip backwards.

Step 16:
Press the upper layer upwards.

Step 15:
Glue these parts together

Step 12:
Fold these two edges into the other direction, use the prefolded lines of step 11

Step 11:
Fold the edges inwards, then open the model.

Step 14:
Push these edges straight upwards

Step 13:
Turn the model

Step 21:
Done....

Step 19:
This is how the upper part looks.

Step 20:
Open the bottom of the model.

Step 18:
Glue the four flaps together.

Step 17:
Fold the edges backwards.

Step 22:
Fold over these two lines. All three parts are the same size.

Step 28:
Glue both pieces together.

Step 25:
Fold the left part in half

Step 26:
Fold both edges in half.

Step 24:
Use the prefolded line as guidance.

Step 23:
Prefold. 

Step 27:
Press flat, see arrows.