I ran across these Rag and Bones Skinny Tuxedo Jeans, and thought what a great DIY.
Get your favorite inexpensive skinny jean -- I am thinking Forever 21, and some black or any color ribbon at your favorite fabric store about 1" wide, and sew or fabric glue down the side. They make a wonderful fabric glue that is clear and stretches.
Hint, If you are going to do the fabric glue, don't get the shiny ribbon as it doesn't work as well, or if you do, be careful of any over gluing.
Photo Rag and Bone Skinny Jeans.