I've been thinking more about the tuck/pleat mentioned. Depending on how it looks, it could very well indicate an intent by a later sewer to make use of the fabric for some purpose--starting to make a shirt/chemise, for instance, and stopping for whatever reason.
Doubtful, Mamzelle. The pleat/tuck in question runs the entire 14 foot length of the shroud. The current theory is that it was added at a later date than its creation to strengthen or spread the force as the Shroud was displayed or carried. Early depictions of the Shroud being carried show it being carried by six Bishops, all holding it by the side with the "side strip" and sewn down "pleat".
Use the following link to examine the shroud in detail:/
Barrie Schworz's website Shroud.Com
It has some photographs of the full shroud and you can see the "side strip" plainly.