What is the ruling on praying in thin clothes that show what is beneath them and the size of the body?

If a garment is transparent and reveals the skin color, then prayer is not valid in it due to the lack of covering the awrah. Underneath this garment, a man must wear something that covers the area between his navel and his knees, and a woman must wear something that covers her entire body. However, if the garment covers the skin color but reveals the size of the limbs because it is soft or tight, then prayer is valid in it, because it is difficult to guard against that.