There are several skirt styles that can be made from ties.  For a shorter skirt, decide how long you want the skirt and cut either the narrow ends or the wide ends to that length, plus a seam allowance for a waistband.  The narrow ends will give you a more-or-less straight skirt, while the wide ends give a full skirt.  Or you can make a long tulip skirt by cutting the tie to use the wide end as the hem and cutting to your ankle or mid-calf length.  Use another heavier tie (like a textured polyester) for a waistband.  More on that later...