Step 1: cut the pants off at the knee at equal lengths.
Step 2: cut a strip of fabric the length you want the ruffle by the fullness desired. For example, I cut a strip of fabric 6" wide by 20" long for each side. The length of the strip should be at least 2X the width of the pant leg. Step 3: Sew ends of strips together. Step 4: Hem one side. Step 5: gather other side. Step 6: with right sides together, sew ruffle to pant leg. Step 7: sew a ribbon on top of seam leaving enough ribbon on ends to tie in a bow. SEW cute!!!!