I have been looking ever since The Sims 4 came out for a flannel like this whether it's directly from EA or custom content, and I am so happy I was finally able to create it! It comes in 13 different colors all with a similar flannel pattern, and no shirt underneath. If you would like a shirt underneath it please download my accessory shirts! Supermassive is base game compatible and has a very loose fit so keep that in mind with certain body types, it also sits far away from the stomach so the mesh looks a little weird inside but is definitely better with a shirt. Feel free to recolor just please refer to my terms of use.

UPDATED 8/18/17
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