I see these "t-shirt bouses" on websites and on pinterest - what are they?

What makes it a t-shirt blouse instead of a blouse or a t-shirt?

Are they woven or knit construction? Or either one? Or both?

Are they just any top that's nicer than a t-shirt?

I'm confused by the pictures I see (a few examples attached) - all are called "t-shirt blouse" by the sites selling - but it looks to me like #1 and #4 are knit, and #2 is a pullover woven, and #3 is a normal button-down shirt.

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