From BAM at Lego store but listing as used as it's not in mint condition.  It's part 973pb3794c01 and is described as "torso shirt with dark blue shoulders and Vitruvian minifigure pattern (BAM) / dark blue Arms / yellow hands"

One shown in picture is one you'll be receiving.  Great shape!  From BAM2020 exclusive to Lego Stores. 

E0434