Fashion design copyright is about protecting the design of clothes, shoes, bags, and other fashion accessories that people wear from being copied by someone else without permission. Just like how your drawings are special to you and you wouldn't want someone else to copy them without asking, fashion designers feel the same way about their designs. They do a lot of hard work to create something unique and beautiful, and they want to make sure that they own the rights to their creations.
Now, imagine that you draw a picture of a puppy with a hat on, and it becomes very popular. Lots of other kids like it and they start drawing their own versions of the puppy with a hat on. But, if someone starts drawing the exact same puppy with the same hat and selling it as their own without your permission, that wouldn't be fair, right? Similarly, fashion designers' creations are like their babies, and they want to prevent anyone from stealing them without permission.
That's why fashion designers can register their designs with the government to get a copyright. This means that they officially own the rights to their designs, and nobody else can copy them without their permission. If someone does copy their design without permission, the designer can take legal action against them.
In short, fashion design copyright means that the people who design clothes own the rights to those designs, and others can't copy them without permission or else they'll get in trouble. It's like how you own the rights to your special drawings and people can't copy them without asking you!