What is the ruling on drawing the shemagh pattern on a girl's shirt, knowing that it may be colored with plant-based colors such as pink?

The basic principle is the permissibility of drawing colors on fabric that does not possess a soul. There is no impediment to drawing the shemagh (traditional headscarf) on girls' clothing, provided it is merely an embellishment and not tailored in the manner of men's clothing. This is because the consideration in imitation lies in the tailoring, not in the color or the fabric.