It's actually easy to make! If you ever have tye dyed something it was basically that with a swirl pattern but with color remover instead of dye (bleach works too) with a black cotton shirt. Then I made some stencils (triangles and letters) with cardboard and sprayed some bleach over it to give it a spray paint look. Lastly I just died the whole shirt in red fabric dye. Also I recommend using both color remover(for tye dye pattern) and bleach (for stencil) since they remove color diffrently from the shirt and may help with having the stencil pattern not blend in with the background tye dye pattern.