The Fringéd Calvins of Thine Hand Advance and Wear What Thou Makest Yond.
This idea came to me while watching a scene in a movie about dancing the "Charleston".
I've always loved the way fringe moves and flows. It's so organic somehow.
Wrap a measuring tape all the way around the leg of your pants leg to find the circumference.
Cut a piece of ½ inch width velcro (front and back) and a piece of woven ribbon to this length.
Put the ribbon and the back of the velcro aside for later.
Thread a needle with strong thread and tie the two ends together.
String a couple inches of beads on the thread and stitch onto the edge of your velcro (front) and knot.
Cut the thread and put a dot of Fabritac or other fabric glue on the knots to secure it.
Continue fringing until you've done the entire length.
Glue your pre-cut ribbon onto the velcro (front) to cover the stitching.
Stitch or glue the back of the velcro onto your jeans where you'd like the fringe placed.
Remove fringe/ velcro for an easy wash day solution.
Alternatives: feathers, faux mink tails or silk fringe.
Bright Idea #1:
Border the bottom of you pants with one row of fringe.
Bright Idea #2:
Test your patience. Make several rows of fringe and attach them from just below the knee down for the full "Flapper" feel.