Sew, let's get going on the button closure for your shirt!
Dontcha love sewing humor? har har.
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Grab your small piece of main fabric, the one that was about 3"x6".
Serge or zig zag stitch the edges.
In the center of your back piece, place it right side down like so, and pin...then using a ruler and tailor's chalk (or invisible ink, or a regular ol pen since you won't see it), draw a line down the center, stopping about 1.5" from the bottom of your fabric piece.
Then, starting at the top, sew down one side, about 1/8" from the line..then over a few stitches at the bottom, and start going back up the other side, but a little bit further from the line. STOP about halfway up and cut your threads..we'll be adding the elastic now!
Cut a piece of 1/8" elastic (mine was about 2" long, you will need to shorten it if your button is smaller, etc), and place like so about 1" from the top. Make sure both ends will be enclosed when you continue sewing. This is why you started sewing up this side a little further from the line-it makes a stronger seam for your elastic!
Add a couple pins there to hold the elastic in place, and pick up where you left off, sewing up the rest of the way. (slowly over the elastic!)
Next, carefully cut along your line with scissors like so.
Turn right side out and press with your iron.
Hopefully your back was a little straighter than mine. lol. And that crease is just lazy ironing, ooh well.
Next, place your front and back pieces right sides together and pin at the shoulder seams. Also, trim up the bottom of your shirt if it doesn't match perfectly. (mine didn't, no biggie)
sew the shoulder seams together and serge or zig zag stitch the seams.
Your last step of the day is to press those seams. Press them towards the back of the shirt. My mom taught me that-it's to prevent bulkiness in the front of the shirt.
Of course, let me know if you have any questions, and I'll answer them in the comments.