Auguste Racinet (1825-1893) was a French illustrator and painter. Published between 1876 and 1888, his Le Costume Historique was the most wide-ranging study of style ever printed, spanning the history of costume, dress, accessories, and even furniture and armor, from ancient times to the end of the 19th century.
In 1888, “Le Costume Historique” was consolidated into six volumes holding nearly 500 plates. Above images are from Volume 4, which focuses on European style from the 9th - late 16th centuries, and includes details of armor, furniture, and interiors as well as clothing.
I spent ages trying to find any reference to Poland’s multi-coloured happy ninja outfit, now tell me the guy in the above image isn’t wearing the same thing!
Now unfortunately I’m not really any closer to finding more information about it. The only information accompanying that image is that it is of a townsman and a gentleman in clothing worn in the second half of the 15th Century. Am assuming our ‘ninja’ friend is the townsman because the other guy is carrying a sword which is a thing you’d expect either a nobleman or someone in the military to be carrying.
The image is taken from the book: Racinet’s Full-Color Pictorical History of Western Costume by Auguste Racinet.
So there we have it. In the 15th Century, Poland was rollin’ around Kraków dressed like a commoner. Going incognito to slip past his adoring public.