Is a garment considered transparent if it reveals body details when praying in high illumination, knowing that it is concealing under normal circumstances, and what are the characteristics of the legally prescribed attire for women in prayer?

If the color of a man's skin appears with light, then the garment is transparent. The covering must not describe the color of the skin, whether its darkness or whiteness; that which describes the skin's color is not a covering. However, if it covers the color but describes the size of the limbs, there is no harm, because the skin is covered, and this cannot be avoided.