When the seam is folded to be finished, none of the inside fabric shows. I am folding along the seam, but the understitching keeps the inside fabric from showing.
This is the view from the inside. The seam and stitching line shows.
This is my attempt to show you both sides at once. The crease of the fabric is right next to the seam.
Here is an example of the neckline of a dress. The blue fabric is the lining and the patterned fabric is the fashion fabric. The lining is held down by the understitching. The peach fabric is a little ruffle.photoshoot dress. The understitching keeps the piping lie flat and the lining inside.
I hope that this makes sense! Good luck with your understitching!