I would like to have a rectangle in the center of the shirt before I dye. Do I need to make a vertical and then a horizontal fold and then draw essentially 1/4 of the rectangle and then pleat to get a straight line? Or should I be looking to do an angular fold and then draw on the rectangle? I am considering this on a hanes beefy t shirt to the material will be very thick if it is double folded. Any thought on how to do this effectively? I have a picture to transfer iron on into the rectangle.