Actually, Mary often wears red under the blue. The question might be, why black? Mourning she doesn’t have a seat? Or to match the eyes of her (alien!) baby?
Japanese subway poster, from the retronaut
The most alien feature of this poster, to European eyes, is that Mary’s clothes are red. In Europe, Mary wears blue, always, without exceptions; actually blue has even be defined for a long time as the color of Mary, as outlined by Michel Pastoureau in his magnificent book, Blue.
Now the question is, why did the Japanese artist chose red?
