What is “Kamon”(family crest)?

Kamon is the family crest which every Japanese family has.
A kimono with family crest is worn on formal occasions.
Family crest often painted on the back and sometimes sleeves, chest on the kimono.
It is depicted in a 2 cm to 4 cm circle.
The best known crest is the chrysanthemum of the Imperial Family.
However my favorite symbol is of course butterfly as you can see our shop logo!
Here are some of kamon butterflies.