Now fold over the belt loop and lightly trace with a pencil around the area to be stitched down. If the leather is not still a little damp from previous steps, you may want to wet it a little around where the fold will be, to help it form easier. I prefer to both glue and stitch parts together. Not only is this much stronger than stitching alone, but gluing holds the parts in alignment so that the stitching job is easier to complete.
Smooth leather needs to be roughened up a bit before gluing. I like to use the tip of a wood rasp to do this, as shown above, but coarse sandpaper will also do the job. You can also roughen up the smooth side of the welt at this time.