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Pair of Tripp style pants to a skirt in a few simple steps
Rip the inseam stitch out
Fold pants in half, allow seams to settle as they will. mark a line from the bottom of the zipper to the outer edge of the pants (this gets rid of the crotch seam nicely)
Stitch along the line you marked. Rinse and repeat for the back.
Trim down excess material and call it DONE!