Mark Hamill (Ep. 6) Prototype Shirt

This is a replica of the shirt worn by Mark Hamill in the sixth film.  Made of Off-White Cotton, this shirt is form fitted for a Men's Large and features a hidden zipper under the left arm.  The collar and bib snaps closed.
 
This was used to develop the pattern for our own costume which is why it's referred to as a Prototype.