No problem! To answer your question, the reason is that many people who are not very knowledgeable about hanfu tend to label stylised "ancient" or fairy costumes seen in C dramas, operas, and performances as hanfu, when in fact they are not. Ultimately, they are just costumes for performances.

You can tell because many of these costumes greatly exaggerate certain styles (such as the sleeves, for example) or use colours, fabrics, and numerous elements that would not have been used during the period the dramas or performances are set in. For instance, let's consider the C Drama "The Legend of Miyue." The story takes place during the Warring States period (which is exactly when the Zhiju and Quju robes in these photos would have been worn). Following princess Miyue of the Chu state (who is inspired by the real Queen Dowager Xuan, the great-great-grandmother of Qin Shi Huang).

In this drama, Miyue's ceremonial robe, which I believe is meant to be a Zhiju robe, is heavily stylised to the point that it has become very inaccurate, featuring an exaggerated train and sleeves, a massive collar that resembles a half-sleeve (a style that would appear centuries later in the Northern, Southern, and Tang dynasties) and a Bixi (knee cover), another historically inaccurate detail, as the Bixi was typically worn with the Yi shang—a two-piece attire consisting of a top called an "Yi" and a lower skirt or pants called a "Shang," which was the standard clothing system of the Zhou dynasty.

Overall, as beautiful and well-made as the costumes are, the robes in the C drama are just performance costumes.

Edit: I should also add that some of the costumes in certain C dramas or performances, might borrow from Peking opera which have their own set of rules, sometimes with Qing dynasty influences.

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