I used to work with this girl who wore a different monochromatic outfit every day. No prints, no stripes, no polka dots. Just one solid color per day. I don’t think she had a favorite color (though she did dye her hair blue at one point); she had really cute yellow outfits, and really cute pink outfits, and really cute green outfits.
I was always kind of impressed by her dedication, because coincidentally I had tried doing monochromatic outfits myself one time in high school and didn’t even last a week before I was reduced to gold fleece. One day, however, she told me that she didn’t do it because she wanted to do it; she did it because she had to do it. It was a problem she had. If she had a blue outfit all set for the day but the only clean underpants she had was green, she would have a panic attack. Nobody would see the green underpants if she wore them, but she would know they were there. I think she must have gone without wearing underpants a lot of the time, or else she was extremely organized.
As I recall, the only exception she had to the solid monochrome look was plaid. I don’t know what that means.