Here are some easy directions for making a tie like the one I made for your frock if you want.
1- First take your excess fabric and cut a long strip that is about 4" wide and 75" long (you may need to sew 2 strips together for your 75" length)
2- fold right sides together, sew at 1/2" seam allowance all the way down the length of the strip.
3- Use a safety pin and turn the entire strip right side out and then press.
4- On both ends of the tie, push 1/2" of unfinished edges inside so that it makes a nice box on the end. Press.
5- Edgestitch (about 1/4") the entire tie on all four sides.
And now you are done. This is how it should look: