Choose leather sneakers with low profile construction and for jeans, stick to dark colors with straight and slim fit
For Him: Wear a tuxedo with all the frills (vest/cummerbund, cufflinks, etc.) For Black Tie Optional, you may also opt to wear a black suit with white shirt and conservative tie
Wear a colorful blazer, sweater, or jardigan but note the old fashion adage that suggests you should wear color with color, and black with black. So if your black dress is your base, you may want to consider adding at least two colors in the rest of your outfit
It also serves as a Wisp communication device
It didn't get a lot of traction outside of Japan, but the mangaka's career took off with the release of "My Dress-Up Darling" two years later