Today, I made this cute headband out of an old knit-fabric dress! I didn't have to use elastic because the dress already had some stretch to it. All you need is an already made headband (or the circumference of your head), an old knit dress (you can find one of those at the thrift shop), some scissors, a pencil and a sewing machine.
Step 1: Finding the Right Size
First you need to cut up your knit dress, so you have a long strip. Since you'll be cutting on the bias of the dress, make sure it's wide enough. Grab a headband (you'll notice I'm using the one I crocheted here) and draw a line around it, making sure it's doubled in both width and height, like the picture above. Make sure you're doing all of this on the bias of the dress, so it will be able to stretch.
Step 2: Cut It Out
Cut it out, making sure everything is nice and even.
Step 3: Sew
Place right sides together and sew along the side, leaving a little seam allowance.
Step 4: Sew Some More
Turn inside-out -- it will be like a tube. Place one end inside the other (folding that part to the inside) and sew it closed. Now you have a headband!
Step 5: Optional: Add a Bow
I also added a bow. You can use the tutorial I did a couple of days ago for doing the same. You can find it here. You're finished!