Zero-waste fashion means designing and making clothing in a way that creates absolutely no waste. It's like when you color with crayons and you use all the colors until they are little bits, and you don't throw them away but use them to make a new thing - that's zero-waste!
To make zero-waste clothes, designers have to be really creative and come up with ways to use every single piece of fabric. That means that they have to plan everything out really carefully before they even start cutting fabric. They try to create patterns that use up as much fabric as possible, without wasting any of it.
Sometimes designers will even use scraps of fabric to make accessories, like earrings or hair ties. And instead of using zippers or buttons that can't be recycled, they'll use things like snaps or ties that can be reused or easily taken off.
Zero-waste fashion is important because making clothes creates a lot of waste, and it's not good for the environment. By using all the fabric and not using materials that can't be reused or recycled, designers are making clothes that are better for the planet.