Doubt you can really convert it everything something like socks for instance, i think you'd need to have a white and grey texture model with color tweak on top to do so. But i doubt its how most envisioned their socks were going to look like, would think it was better if they still got base white and grey model to make a couple more sock variations for instance instead of textures tweaking options for those. Maybe also consider making same model share spots where you can use a shuffle to look through variation, bit like prints work on T-shirt now. Evt. once they start adding more cloth models it going to be to much scrolling picking cloth items. Red socks for instance look something like this: (there will be a weak light red on white instead of current white area)