Measure on the pattern piece, the difference between skirt layer 2 and 3 and remember to write this down. Make skirt layer 2 as described and measure how much the circumference of the bottom is of the full skirt. Multiply this circumference by 1.6x and then divide by 3.
Example: The difference between length of skirt layer 2 and 3 is 13 cm, note this.
Your skirt circumference totals 3 meters.
Multiply this by 1.6. Then you end up with 4.80 meters. Divide by 3.
Then you end up with 1.60 meters, note this.