back in college I had a SERIOUS I dream of jeannie problem.
it was really bad, I'm kinda embarassed about it now.
My freshman year I dressed up as Jeannie's twin sister (also: Jeannie) and I made the costume myself
I wore a green sports bra and put gold trim around it. My hat was made out of an old butter tub (one of the small ones) that I put alternating stripes of mint green and green fabric around. Then I trimmed it out with the same gold trim.
I wore a striped skirt instead of Jeannie pants. you could:
a) make an a-line skirt that's really long. Measure your waist. Figure out how many stripes you want to have. Divide your waist measurement by the amount of stripes. The number you get will be the measurement for the top of the stripe. Add two or three inches. That's the bottom of your stripe. figure our how long you want it to be. Get a big piece of paper and a yardstick. Draw your first line (x). Perpendicular to that, draw your length line. Perpendicular to that draw your line that's X+3. Connect the dots... you get a big trapezoid. Cut out a bunch of those, remember to include seam allowances. Sew 'em together... The easiest way to keep the skirt up would be a draw string. tah dah! Instant Jeannie skirt. See the picture
you could wear a pair of green leggings or tights (get 'em at target or somewhere like that... green fishnets would be cool). Make a waistband and attach thin, straight strips of tuelle to the waistband in the length you want the skirt/pants to be. Attach the bottoms of the strips to your ankles. instant sorta jeannie pants.
my bad drawing of how to make a skirt: