A Chinese Silk Robe referring to the historical dress of the Han Chinese people. Some styles of hanfu have a circular collar. There are several styles that are at times mistaken for kimono (most notably qixiong ruqun, see first image in the female example). You can typically distinguish between them based on the hairstyle and headwear. Males' hair may be pulled back into a simple ponytail or bun or held by a coronet. Emperors or princes may wear Mianguan (see image 1). If nothing else, huadian (forehead mark), or the circular fan is an easy distinguishing mark.
Examples of matching styles of dress for each dynasty
Zhou Dynasty: Han Style: Xuanduan (male), Quju (female)
Tang Dynasty: Yuanling Shan (male), Qixiong Ruqun (female)
Song Dynasty: Lanshan (male), Narrow-sleeved Beizi (female)
Ming Dynasty: Daopao (male), Aoqun (female)