With this tutorial, you find out how to create a checkered pattern from the sleeve of your T-shirt. While you might do this with the two sleeves, I personally really like that she only did it with a person and remaining one other off-the-shoulder. It makes for an edgier look. https://flenzy.store/best-dad-t-shirt-best-fathers-day-t-shirts-round-neck-top-fathers-tee-shirts/