I have an alterations business and work on this type of fabric often. One of the easiest ways would be to stitch a line 1/4 inch below where you want the hem. Cut off the extra fabric leaving 1/4 inch. Then turn the hem under and stitch, either by hand or machine. You could also just press it under the 1/4 inch, cut and then sew, but if you are not used to doing this the stitching method might be easier.