What fabric is the shirt made of?
High-grade cotton shirts, soaked in water, and then take out, it will flow down, but not as obvious as chemical fiber, so much water to stay down.
Ordinary shirts are made of fabrics, usually made of cotton and synthetic fibers, which are then woven into yarn. This fabric will be relatively hard, when washing, it is obvious not to hang water (chemical fiber does not absorb water).
Ordinary shirts are non cotton (cotton, chemical fiber), high-grade shirts are pure cotton material.