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This is obviously based on this famous (mass-produced) T-shirt. Note the (almost succesful) attempt to get my dogs' likenesses right!
And while we are on the subject of T-shirts: On May 28, there is a big "Computer celebration day" event at Alza shop in Holesovice. As a part of this event, 8-bit Sinclair museum will get its grand opening and there will be some 8-bit T-shirts available, "designed" by me. One example:
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As for the price / means of availability of these, I have no info yet.
UPDATE: You can buy them here!