>>1799297First of all, nothing has to be like I did it, it's just some inspiration, also white goes like black with every color, but together as a scheme they are overused and boring heh.
I interpret the version with the red shirt as traditional Chinese clothing, so a combination with the Chinese Zodiac sign rat makes sense, I guess.
The "too much white, because lab mouse" aspect can be kept by making the undergarment white to cover most of the visible skin. Also I don't think a laboratory mouse has no history of being somewhat harmed, so maybe at least one notched ear is reasonable. I don't know what the backstory of the character will be. I only can think about two options here; Mouse that flew out a facility and wants to take revenge or a mouse that works voluntary together with scientists, besides knowing it gets harmed.
Shoes... I don't know if you even want some, I just popped some combat boots? over the legs.
Because the character is literally human-sized mouse, maybe a collar as a choker as an option as well.
Since the mouse is from a laboratory facility or something along that line, maybe some kind of top secret or complex electronic device is connected to it, so I thought maybe a monitoring device makes sense, which shows all data in real time. We can go further and even make this into a gimmick for the character, but I don't know exactly how you could realize a heart rate monitor in real time on a Live2D avatar/3D model.