Due to the deepness of the color, midnight blue formal clothes are often almost indistinguishable from black.
en.wikipedia.org Midnight blue is the color of a vat full of indigo dye; therefore, midnight blue may also be considered a dark shade of indigo.
en.wikipedia.org Worsted barathea (made with a smooth wool yarn) is often used for evening coats, such as dress coats, dinner jackets, and military uniforms, in black and midnight blue.
en.wikipedia.org A couple of crisp white shirts, a few pairs of branded denim jeans, odd coats and most definitely, sharp, well-tailored suits in black, steel grey and maybe, midnight blue.
www.dnaindia.com By 1912, all cars were being painted midnight blue with black fenders.
en.wikipedia.org