There are many versions of this shirt out there but most of them are not accurate to what Jayne Cobb actually wore on Firefly.  Throughout the show there were some discrepancies with the Blue Sun logo and while the inaccurate shirts do have an accurate representation of how the logo was depicted elsewhere in the show this one is accurate with respect to the shirt.  The difference is the Chinese lettering at the bottom.  The first character of the shirt is a more general character for Blue that includes all shades of blue.  The inaccurate shirts use a different character more specific to a particular shade of the color blue.  The research was interesting and really made me wonder if there was something intentional there or if it was merely a blooper.  Regardless if you are looking for a high quality shirt that accurately duplicates what was worn on the show then this one is a no brainer.