This tutorial shows you how to make a pattern for a circle skirt which perfectly fits any bodice, whether it is for children or women. Or small pets.
1. Measure the width of your bodice pattern. Measure it at the bottom, right where the skirt and bodice will be joined (so just above the bottom seam allowance).
A. Cutting a circle skirt in one piece? Then, do not include the side seam allowance when measuring.
B. Cutting two half circles? Then, do include the side seam allowance when measuring.
2. Divide this by 1.5707. Next, subtract from this the seam allowance which you will use to stitch the skirt to the bodice.
Example in inches: I have a bodice with a width of 10" and will stitch it to the skirt with a 0.5" seam allowance:
10" divided by 1.5707 is 6.37"
6.37" minus 0.5 = 5.87"
Example in cm: I have a bodice with a width of 25 cm, and will stitch it to the skirt with a 1 cm seam allowance:
25 cm divided by 1,5707 is 15,92 cm
15,92 minus 1 = 14,92 cm
3. Take a large piece of paper (doesn't have to be pattern paper; you can also use a newspaper, or wrapping paper), a pencil, and a piece of cord which does not stretch.
Fold the piece of paper in two diagonally, as shown in the picture, so as to create a 45° angle. Fold back open. Take the number you calculated in step 2, and measure this distance from the top left corner to the top edge and left edge of the paper, and onto the diagonal fold you just made. Mark.
4. Tie the piece of thread around the pencil. Congratulations - you just made your own compass! Use this to connect the three marks you made in the previous step. This will be the waist of the circle skirt.
5. Next, determine how long you would like the skirt to be. Add to this the seam allowance you will use to stitch skirt to bodice (same number you used in step 2) and also the allowance for the hem of the skirt (unless you serge instead of hemming, of course).
Tip: for a circle skirt, you want to keep the hem as small as possible.
Length finished skirt + seam allowance + hem allowance
Example in inches: I would like the skirt to be 8" long; I'm using a 1/2" seam allowance; and I will hem the skirt by folding it in by 1/4" twice (so I'll need 1/2" in total).
8" + 1/2" + 1/2"
Example in cm: I would like the skirt to be 20 cm long; I'm using a 1 cm seam allowance; and I will hem the skirt by folding it in by 0.7 cm twice (so I'll need 1.4 cm in total).
6. Measure this distance from the three marks you made in step 3, onto the top edge, left edge, and diagonal fold. Take your poor man's compass to connect the three new marks.
7. You now have a pattern for a quarter of the circle skirt.
A. Cutting the skirt in one piece? Fold your fabric West to East, and next from North to South, and press the folds (for more precision). Pin the pattern on the fabric as shown in the picture, and cut.
B. Cutting two half circles? Fold your fabric in two (putting selvages together), and cut twice on the fold.
8. A little word about pinning the skirt to the bodice. If you cut the skirt in two pieces (option B), then there is only one way to pin: you just align the side seams of the skirt with the side seams of the bodice.
However, if you cut the skirt in one piece (option A), you will want to take into account the grain line of the fabric. For instance, if you would like to have more flare in the front and back of the skirt, you need to place the bias-cut parts of the skirt in the front and back. If you would like to have more flare at the sides, place the bias-cut parts at the sides.
See? Your math teacher told you that those geometry classes would be useful one day, didn't s/he?