This vintage real photo postcard features a parade on a street lined with spectators. The caption below the image states “A large coach of horsemen and their darlings”. “Charros” are traditional horsemen from the central-western regions of Mexico. The definition of “Chinas” was difficult to pinpoint. Research yielded several definitions but the one that fit best was “darlings” or “honeys”. The Kodak (Sello) stamp box on the reverse of the postcard indicates that it dates back to 1941. The postcard was published by Kodak Mexican Ltd. SOLD
THE CABINET CARD GALLERY 
This from Wikipedia: “China poblana (Chinese Pueblan) is considered the traditional style of dress of women in Mexico, although in reality it only belonged to some urban zones in the middle and southeast of the country, before its disappearance in the second half of the 19th century.” This distinctive festive dress, popular only in in Puebla, is the context I’m familiar with.
Thanks for the information. Great detective work. The photo reminds me of some scenes in your books. Interesting that the men in the coach are horsemen, recognized for their talent while the woman are recognized for their attire.