What color should the big red skirt match?

Of course it's red! If you use other colors as the lining, it will affect your original red skirt, because the skirt is originally red and a little transparent. If you add other colors, red will not be pure. This is just like learning three colors when I was a child. Their coincidence will produce other colors. I bought a big red skirt a day ago. Both layers are red and not transparent at all. Look, that's it, hehe.