I'm a huge fan of Japanese craft books in that though I can't read a word of what is written, the illustrations and photos are so easy to follow that I can make anything in them. This 'ible is written in that same vein, I hope the photo's are enough for you to follow without even reading the text, though it's there is you need it.
Don't forget to vote for me in the sewing contest!
Step 1: Supplies
2 Safety Pins
1/4 inch wide elastic, about 25 inches
Step 2: Measuring the Shirt
I am medium sized, I measured from where I wanted the shirt to begin, to how long I wanted it to hang - that was about 18.5 inches. So I cut the pillow case 20 inches long. Next I measured around my upper body under my arms with the elastic and made sure it was snug but not tight. That came to 24.5 inches. Add a half inch to that for the sewing of the elastic together.
Step 3: Measuring the Straps
Step 4: Turn your pillowcase inside out
If you want to simply sew a channel for the elastic to run through that is fine but if you run two rows of stitching you will have a nice "gather" on the top.
Step 5: Sew the channel for the elastic
Give or take an inch and a half for your folded over fabric, there are no rules here, do what looks good to you. Note that this seam is on the inside of the soon-to-be-shirt.
Step 6: Preparing to insert the elastic
In this step I simply used my seam ripper to open up the side seam from the pillow case to insert the elastic with a safety pin attached to help to thread it all around the channel. The safety pin helps you know where the elastic is as you are pushing it along.
Step 7: Inserting the Elastic
All this is a lot more complicated to write about than to do.