I am not an expert on these things but it seems to me this could be done.

Is this Ran hugging Conan? Take a screenshot, of this video, https://youtu.be/ubeaf0xss0Y
Then go into photo editor, fix it up as you wish (add in “Case closed!”), and have it made into an iron on decal you can put on a T-shirt. Here is a company that makes iron on decals with images you provide. https://www.stickeryou.com/products/iron-on-transfers/616