You don't need to spend the big bucks at American apparel to get the look that you want. With some stretching fabric and a little bit of work, you will be making your own hand made legging collection.
Start off with a pattern. This shows you how to make the measurements you need to make your own pattern. If you don't want to go through the trouble, you can simply buy a pattern.
I used McCall's M5759 pattern and made a few minor adjustments
Fold your fabric length wise with both the right sides facing up so that you can make two identical pieces.
Lay the pattern in the middle of the fabric.
Pin the pattern to the fabric
Cut around the pattern. I kept some length to the legs because I wanted the leggings to go down to my ankles.
Separate the two leg pieces and fold each of them in half length wise with the right sides facing in.
pin the edges
Sew the inner leg edges of each leg using a double stitched seam
Stop sewing right before you get to the crotch on each leg.
Press the seam allowances of each leg
Now you have 2 legs with pressed seam allowances
Fold one of the legs right side out.
You have turned one leg right side out. Slip it into the remaining leg.
Stitch around the crotch using a Double Stitched seam.
Press seam allowances
Pull the leg out of the other and now it's time to make the band
Fold the upper edge of leggings inside along the fold line.
Press the Fold
Stitch along the fold line leaving a small opening to fit the elastic into.
Measure your waist line and add 2 inches onto the band.
Put a safety pin through the elastic band and pull it through the waist line
Pull it through until it comes out the other side
Sew the elastic together and sew the opening of the waist band up.
Fold your leggings right side out and try them on!