If you have a serger, the easiest and neatest way I have found is to cut the garment 1/4 inch longer than you need. Then serge the edge with the right side of the fabric facing up. Turn the 1/4 inche to the inside and press. Then stitch on the right side as close to the edge as you can. I have a ready made garment on which this was done and I find it useful on any crisp fabric. Nancy Zieman also has a method of sewing a straight stitch 1/4 inch from edge ( then turn it up and stitch 1/8 inch from edge. Trim very carefully the raw edge. Then turn it up 1/8 inch and stitch again very close to the edge.) You would have to cut off the garment at 3/8 inche below where you need it. The sheer shirt she showed looked really nic.