Ok, here's what I've came up with using instructions from the net and my own algebraic calculations. Yes, I'm a math geak!
I will use dd6's measurements since that's the one in the pic that UtahMama referred to.
Waist 21" x 2 = 42 + 6" (for seam allowance) = 48" for 1st tier of skirt
1st tier x 2 = 96" for 2nd tier
2nd tier x 2 = 192" for 3rd tier
To figure length:
Measure desired length - 15" divided by 3 = 5 + 1" (for seam allowance) = 6
So, I cut three tiers that are 6" wide.
You could stop here and use this for solid strips. It takes 1.4 yards of fabric to do solid strips using the measurements above.
OR you could go on to figure for patchwork skirt...
Determine how many fabrics you are going to use. For this one, I used four. I want the patches 6" wide because 48" 96" and 192" are easily divisible by 6 and it's a good size to start with. Remember when you want your patches to be 6" wide to cut them 6.5" for seam allowance.
First tier:
48" / 6 = 8 patches *** I need 2 patches of each fabric
Second tier:
96" / 6 = 16 *** I need 4 of each fabric
Third tier:
192 / 6 = 32 *** I need 8 of each fabric
Now cut 14 patches of each fabric 6" x 6.5" (2+4+8=14) NOTE: When using prints that have a pattern you want to make sure that your pattern is the direction you want it to be. The 6.5" measurement is horizontal and 6" is vertical. You don't want Mickey lying sideways on your skirt!
For 45" fabric, this takes 13" of each fabric.
Construction:
Arrange your patches however you want them, and sew right sides together then sew end to end making three large circles.
Make elastic casing in 1st tier OR make 2" waistband and make casing in that. DO NOT add elastic yet.
Hem the 3rd tier
Gather 3rd tier and attach to 2nd tier
Gather 2nd tier and attach to 1st tier
Gather 1st tier and attach to waistband (if using one)
Insert elastic and let the twirling begin!!!!!!
Disclaimer:
I found most of these instructions on the net and probably from others on here, so don't go thinking I'm a genius or anything
This is probably confusing as heck, so feel free to let me know so!