Just like there are rules for western-style dressing, there are several different types of kimono and each has the appropriate TPO. Here are some examples.
The modern kimono ”homongi” for official visits Homongi is less formal than tomesode and furisode, but is worn at official ceremonies or parties like the vintage dress. The characteristics of homongi is the connecting design on the chest, shoulder, sleeves and skirt. Generally, the owner puts 1 or 3 family crests.
The modern kimono ”komon” for private & casual occasions. Komon is the kimono decorated by stencil dyeing with small patterns. The design is quite flexible (yuzen dyeing, tie-dyeing etc) and each komon has very unique atmosphere. The owner can enjoy choosing different komons to show her fashionable sense.