To shorten a pattern of a skirt, find the line indicating the place to shorten the skirt or draw one. Measure the distance to shorten then report it in parallel to this line.
Overlap these two lines and maintain the pattern with tape and redraw the sides.
Redessinez les bords du patron.
Do the same on the front and back of the skirt.
To lengthen a pattern of a skirt, find the line indicating the place to shorten or lengthen the skirt or draw one.
Cut along this line and paste it on a paper. Draw a second line in parallel of the measure you need to add.
Redraw the grainline to align the other piece and paste it.
Redraw the sides of the skirt.
Do the same with the front and back of the skirt.