I would like to, but right now we can only change the texture of Lara's outfits. We can change what color it is, and how light and shadow works on it.
What we can't change is Lara's mesh, or the shape of her body. She will always have folds and wrinkles of material down her legs from her pants, she will always have buttons on her bottom from her pockets, and she will always have a flap of fabric between her breasts from her shirt. I could make that all the color of her skin, but I couldn't make it Lara's shape. It would look like Lara was wearing a skin-colored shirt and skin-colored pants.
It would help if we had at least one of two things:
1. A tool that allows us to change Lara's mesh, or
2. An outfit with a mesh that closely follows the shape of Lara's body.
If the game designers released tighter pants that hug her legs without those folds and creases, or a bikini outfit, then we could take a serious shot at making a good nude mod. Right now I just try to make mods that look believable.