Cut a piece of fabric, scraps work great! I did mine about 9" long and about 3.5" wide then tapering down to about 2.5" wide at the end. Make sure to cut the 9" end on the fold. (As shown in photos)
Then open up the stretchy fabric and put it on top of the lace fabric (right sides together), pin and cut out the front piece. (this saves a step by doing it this way, this way the two pieces are already to be sewn together!)
Then before you sew, sandwich an elastic piece in between the two fabrics and pin in place so it will be sewn in. (The size of the elastic will differ upon the size of the head you are making this for, I would start big and before you sew the other end into the elastic put it on the person and see how long it should be.)
Now start sewing the two pieces together starting at the end without the elastic and sewing all the way around the whole piece using the sewing machine foot as your guide, and leaving the end (without elastic) open. When you sew around make sure that your stitches catch the elastic. If you have pinned it to the end you should be OK.
Now using my favorite "grabber thingy" turn the headband inside out. (I know it looks kind of twisty turny, this is because of the knit fabric I chose, but don't freak out, a little top stitching will help flatten it out.)
This is what it looks like turned right sides out and the little piece of elastic sticking out.
Now for the top stitching so it doesn't look so twisty-turny. I again use the edge of my presser foot as my guide and top stitch starting at the open end, again leaving open at the end without elastic.
And this is what it looks like with the top stitching.
Okay, now working at the end without elastic, you will turn both the lace and the knit fabric ends to the inside, to make a nice finished edge and insert your elastic end into it and pin it down.
Now stitch the ends closed catching the elastic inside.
This is what it looks like from the back finished.
Front finished view. Now it just needs embellishments!
A few ideas for embellishments. Using your favorite adhesive attach the embellishments you have chosen. (I usually like hot glue).
Always get a plan for where you want your embellishments to go before you glue them down. Then one by one glue them into place. (I like to group them together and stack too, for instance, these different kinds of flowers are grouped close together and then the glitzy button is stacked on top).
This cute little knit and lace tunic I found at Target and was the inspiration for this headband.