It seems to be officially branded by Marvel, a friend I have would really like it for Christmas, and after extensive searches I can't find the exact same thing. I tried:

The small design on the front is the only design on the shirt, nothing on the back.

Google, google reverse search w/ pic, etsy, temu, redbubble, official marvel store, official disney merch, ebay

Thanks in advance for the help redditors!