First of all, a Kimono Princess shuns typical seasonal designs and colors. Pink for cherry blossom season? So 10th century...unless it's the kimono LINING! Vintage jazz-age patterns or modern ironic graphics are the most popular for new style kimono hime.
Hulisode: long sleeved formal kimono, single women only
Harajuku Girls in Kimonos
And Kimono Princesses sometimes wear jewelry. (There's actually a reason Japanese women don't have a big history of wearing rings, necklaces and pins – kimono fabrics were often more costly than jewels, and nobody wanted to risk something snagging or AI YI YI putting a hole in the priceless fabrics. But new style kimonos aren't expensive – most of them are vintage – so even cheap costume jewelry is safe to wear.)
A true Kimono Princess uses every accessory – shoes, sox, purse, wrap, hat, gloves – to flaunt convention in some subtle way.