The good news when you sew jersey, stretch or knit fabrics is that the patterns are much simplier than for a non-stretch fabric. Almost no darts. Nevertheless, if you want to make a made-to-measure garment, you still need pencils, calculator and a curved ruler.
Here’s how you can simply realize the pattern of a jersey bodice. The front and the back are done in the same time.
I suppose that you have already taken the following measures: waist, bust, hips, height of the hips, arm-to-arm chest width, arm-to-arm back width, round neckline, shoulder length, front neck-to-waist and back neck-to-waist.
Draw a vertical line XY respresenting both the center front and the center back. On this line place the following points:
AB = height of the hips
BE = front neck-to-waist
BF = back neck-to-waist
BC = ½ BE
CD = ½ EC
Then draw the following perpendiculars on XY:
BB1 = ¼ waist
AA1 = ¼ hips
CC1 = ¼ bust
DD1 = ½ arm-to-arm chest width
DD2 = ½ arm-to-arm back width
To draw the neckline curve you need to trace two perpendiculars
EG = GH = 1/6 round neckline. On the bissecting line EG / GH, measure 2.5 cm and draw the front neckline with the curved ruler by observing a 1.5cm flatness from the center front.
Draw an horizontal line FI. On the bissecting line FI / IH measure 2.3 cm and draw the back neckline HF by observing a 3 cm flatness from the center back.
Place J to have GJ = 1/3 GH. From J, draw an horizontal JK in order to have HK = shoulder length.
Draw the side line with the curved ruler: A1B1
And the last calculation:
B1C2 = (front neck-to-waist + back neck-to-waist) / 4 + 2.5cm.
Join B1C2 through C1.
Draw the front armhole curve KD1C2 and the back armhole curve KD2C2 by obseving 1.5 cm flatness for the front and 1 cm flatness for the back from C2.
Your pattern is now completed. You do not need to add the ease as the jersey tends to ease up already. Try your pattern and adjust the armhole curves if necessary.
This method is taken from the pattern-making book of Teresa Gilewska. I just changed the curve of the back neckline; in the book it is more tricky.
For the first try of this pattern do not choose a cheap jersey and go for something like the wool jersey, which is a bit more expensive more firm than a simple cotton jersay.
So, how do you feel about this method? Rocket-science or not?