In order for your hide to be invisible, you must choose your camouflage pattern carefully, either realistic or furtive, in 2D or 3D. The colours should reflect the environment in which you will be hunting. Its opacity should enable you to remain unnoticed whilst not obscuring your view.
Even if the hunter spends several hours in the hide, there is no need to overdo it, as the larger it is, the more difficult it will be to blend into your surroundings. If you can, consider dressing it up with local vegetation.