Bingmei robe color?

I see a lot of artists draw Bingmei with a white outer robe, but I just read the fight in volume four and the original Luo Binghe is said to wear a white robe while Shen Yuan's "Bingmei" is in all black. Is it just a fan-to-fan subjective thing? Asking cause I wanna cosplay Bingmei lmao