Two ways to finish faced hem corners (Open Front Garments)

If you are sewing a garment that has a open-front facing, perhaps one of your greatest challenge (as a sewing beginner) will be clean finishing the facing at the hem. Regardless of the technique you use, a faced hem corner should be well-defined and lay flat blending seamlessly into the rest of the garment's hem. 
There are two conventional techniques you can use to clean finish a faced corner- one is completed by machine the other is applied by hand. Regardless of which you prefer to use, if the fabric layers are folded correctly and ironed, both methods will result in a clean, professional finish: 

A hand-appleid faced hem corner is completed using a blind stitching application called slipstitching. The stitch, especially if applied with matching color thread, should disappear along the folded faced edges resulting a in what looks like a machine finish. 

To seal the facing at the hem by hand, fold the facing layer in its natural position using the garment's hemline finish as a guide.  Slipstitch the facing's vertical open edge to the garment's hem allowance layer underneath until you arrive at the faced hemline. At this point the folded edge of the facing is slipstitched to the garment's folded hemline to seal the two edge shut with an invisible stitch. A slipstitch taht is appleid from fold to fold is called even slipstitching. 

You can clean finish a face hem corner using a machine stitch by flipping the facing layer over the finished (faced) edge such that the facing and garment layer are touching and the hem allowance edges are perfectly aligned. In this position stitch the facing to the garment layer following the hemline as guide. It helps to either transfer your hemline to the garment layers by marking or creasing the line with an iron. 

When the  stitched face corner is flipped on its right side and placed in its natural position, the clean-fined edge should blend into the folded edge of the hemline, with the corner featuring a sharp, well-defined corner edge. As final step, always iron the faced hem corner in this final position to smooth and flatten the layers.