Let’s face it. We all just want to fix our patterns to fit our body shape and make a garment that sews together easily and looks great. I see a lot of very valid pattern corrections suggested to hobbyists that help solve the problem, but oftentimes the follow-through details are overlooked and can create additional issues.
Here is one that I ran across recently for a commonly needed alteration:
The back of a skirt ends up shorter than the front
Why this happens: Generally the distance from waist to floor is shorter on the front than the back because the back waist to floor measurement must include the extra distance needed for the curve of the buttocks.
What to do: The suggestion was made to slash open the center back seam at hip level, to zero at side seam, and add the necessary length. True the CB seam. End of expanation.
The problem: This will get you the extra length but this also changes the angle of the hem (figure 1), or if you angle both cut pieces equally you still have to re-create a straight CB seam, if back is one piece, (figure 2) which means that you will have to cut off part of the hip width and then add it back to the side seam.
Here’s my suggestion: If you do not have a horizontal stripe or visible horizontal texture and only need a little extra length: just add the length to cb bottom hem, blending to zero at cf. (figure 3)
If you need to add more than 1″ and/or have a visible horizontal pattern:
Slash open the CB and pivot only the top cut half. Re-draft straight CB line based on skirt. Your waist is now longer. Take the amount that was added and make the dart deeper based on this (figure 4). Fold dart and true waist shape. Double check that the skirt waist will match to the waistband or waistband facing.
Please let it be known it is not my intention to disparage anyone’s techniques. This is just my suggestion. By no means is my way the only way that it can be done. Like many alterations, there are lots of variables that can change the procedure. My point in this exercise is that pattern corrections require a lot of fore-thought, meaning that you always have to be thinking two steps ahead of any correction as to what it will change and the best way to maintain the look.