Happy to hear you are enjoying the game :)
More customisation is being added and planned, but due to them needing to be added to the action CGs as well, I need to be quite selective of what I add.
Sheer clothes is already in, press the button on the rightmost of the colour buttons to cycle transparency/fishnet.
Patterns is something I tested but wasn't able to get looking nice.
Two tone hair is on my todo list, but for now there is a mod on discord to do it, as well as two colour eyes.