Some people don't get about traditional dress is that it's not just a dress for the people who wear it, but also a symbol. And parts of it may have deeper philosophical meanings you need to view the history to understand. To you, it might be art, but for them it's history.

For example, all hanfu-derived dress has a center back seam. There is a philosophical explanation for this: to remind people to keep a straight back. And a practical one: So the fabric can be replaced without having to get a larger piece.

Hanbok is shaped like a triangle on purpose. To the outside eye some people call it "frumpy", but to the people who wore it it was a symbol carry-over from Hinduism. The upright triangle is a symbol of heaven. (Women are heaven).

The colors used on hanbok seem random to outsiders, to Koreans, there is a color harmony and "age" to colors one has to obey, which still affects modern Korean fashion today.

The embroidery being sewn separate probably to a European eye seems like a waste of time--why not do it directly on the fabric? To the Korean eye, it's a way to replace the embroidery when it becomes worn out.

In another words, there is reasoning to each, and a history of decisions to each, religious attachment along the way. It's not just any old "costume", it's a symbol of history of struggle, thought art and so on. So it hurts when people think it doesn't matter and gets it wrong.