Maybe the shirt was used at CES back in 1993 or maybe it would have been worn by Babbages or EB clerks on launch. It even promotes the FX chip. The seller has it at best offer and it is the last day (around 13 hours left) so it's possible someone could get a deal. It makes me wonder about other cool pre-E3 promos.
Neat, they gave these away during the Super Star Fox Weekend event as well. They also gave away a really rare pin at CES 93 which resembles the one at Star Fox Weekend but was slightly different.