Here is another variation on the teeshirt dress. I think this one is easier than the circle skirt variation (although that one is not really hard, either) and after making a few of these you will be a pro at gathering!
First, gather your materials. You will need a teeshirt and skirt fabric. The skirt fabric is totally up to you. You can use all one fabric and use the tiers to create fullness or you can use multiple fabrics. Not all these examples are on a teeshirt dress, but you can get an idea of the different things you can do with a tiered skirt:
Once you have decided on your fabrics you need to do some (simple) math. Decide how long you want the skirt to be. Divide that by the number of tiers you want your skirt to have. This is how WIDE each tier of the skirt will be except for the bottom tier. For the bottom tier you need to add a hem allowance. If you're folding up twice and stitching like we did in the first dress, add 2 inches.
So, if I want my finished skirt to be 15 inches long and I'm using 3 tiers, the first two tiers will be 5 inches wide (15/3= 5) and the bottom tier will be 7 inches wide (15/3= 5+2= 7)
My formula for determining the length of the tier is:
1st tier = X
2nd tier= X + (1/2 * X)
3rd tier= 2X
My most often used value for X is one cut salvage to salvage (side to side), or 45 inches. The second tier is then one cut salvage to salvage plus another 1/2 cut salvage to salvage and the third is two cuts salvage to salvage.
Sew your tiers together. They should look something like this:
Now you're going to gather the longest tier to fit with the shortest tier. Sew the two tiers together being careful to keep the same seam allowance the entire time. This is Very Important to the finshed skirt!
repeat, gathering the middle layer and attaching it to the top layer:
Fold the skirt in half, matching the tiers up as much as possible (this is why it was so important to keep the same seam allowance! If you didn't your tiers won't match up!) and sew up the side:
Gather the top of the skirt and attach to the shirt in the same way you attached the regular teeshirt dress. Finish the hem and you're done!