Help me find a shirt?

I want to find just a purple and black striped t-shirt, like Schroeder from the Peanuts. I know, I have an interesting idea of style ;)
I’m probably not looking in the right stores, but I can’t find anything like that, which is odd because it’s a pretty simple shirt design.

I’m a girl, but women’s shirt sizes are usually kind of big for me and I don’t like the fitted kind. A boys’ size would be great. However, I’d consider whatever you can find.