|I am really reluctant to share this picture, but the info is too important to keep.
I was using fabrics on hand for a fitting muslin of a new (for me) pant pattern and had my DH take pictures so I could study the problems. The photos are much more revealing of problems than the mirror.
Because I was using FoH, the front and back were of different fabrics. It was MUCH easier to discern which issues were 'front' and which were 'back'.