The formality of the Kimono is woven into it by selection of fabric, color, patterns and designs. The etiquette determining which Kimono will be worn was developed over the Edo period is still recognized today. Kimono worn were determined by the formality of the occasion, their marital status, as well as the season of year. Occasions considered most formal are weddings, ceremony, and funerals. Following in importance would be formal receptions and formal parties, followed by social visiting, going into town for shopping or errands and the most informal every day wear.
The placement of the family crests also determines the rank of kimono for ceremonial and formal wear. The formal kimono must be made from glossed dyed silk. Today, the color of the kimono does not hold the same meaning as they once did. Certain colors such as purples and reds were worn by royalty. Today, the most formal kimono is solid black and the colorful kimono is more casual.formality
The crests are a clear distinction of whether a kimono is formal or casual. The design of the crest is not as significant as it once was. A kimono can be formal without the placement of a family crest; there is no informal crested kimono.