Amazon has them. Not quite the same but I assume the quality is better
Cats in Space Leggings: Large Blue https://www.amazon.com/dp/B01J24DOJ8/ref=cm_sw_r_cp_apa_i_p-3HDbNK5DXYG
These aren't the same thing, but maybe they'd appeal to you, too. https://smile.amazon.com/Cats-in-Space-Leggings-Large/dp/B01J24DOJ8/ref=sr_1_19?keywords=%22space+cat%22&qid=1569167720&sr=8-19