There's strength in numbers. One designer isn't going to change everything. Everyone has to demand that their materials are being sustainably sourced. Just like how cosmetic companies won't test on animals, there have to be benchmarks that we can all adopt.

It would be great if everybody got a conscience. If we started to take more responsibility for the pollution in the world caused by the fashion industry, and to produce less, but better-thought-out goods. Then it becomes worth saving up to buy something beautifully-designed because you can and will keep it, rather than buying a bunch of disposable fashion items you'll probably wear once before throwing away and adding to the waste stockpile. I do think people used to buy clothing with a more thoughtful approach.

When people wear our Bolivian knits and see who knitted them, they are excited because they know they are supporting this women's cause in Bolivia. And it shows you that we are all connected. It's not a machine making your clothes in a black hole somewhere. There is a human being behind it, and a community there.

I've always been very aware of environment. When I was a kid I wanted to be a marine biologist until I realized I hated being underwater. I think a lot of that came from traveling and seeing the levels of waste produced by so many factories around the world.

For us, every day is Earth Day. It's like with Women's Day recently, I said, "Every day is women's day - we're women!" It's something that we sort of take for granted.

If you feel good about your clothes, you get excited. And I want women to feel good when they're wearing my clothes - not just because they're beautiful, but because the process and every step involved in making them is incredibly thoughtful. You can be proud wearing them.

We can't start with big thinking, we have to approach it little by little. Sustainability isn't going to become big right away. Each day you give yourself a little bit more responsibility. It's not ideal, but that's the only way things change, we can't just keep ignoring it.