Learn to invest in the best quality you can afford and wear pieces in different ways.

I love fashion because it's plugged into the zeitgeist, so it's always changing. Thirty years ago, I could never have predicted I'd be where I am today, so I know I don't know what's going to happen in the next five years or the next 20 years. I have my predictions—I'm sure technology will continue to have an impact on fashion, particularly the way people shop. I think quality will be increasingly important—we're moving away from a time of fast fashion. But really, the only constant in fashion is that you must keep moving forward, otherwise you'll be left behind.

I hate the idea that you have to give up anything. I think you can be powerful and still be provocative, you can be smart and have a softness, you can have all of it.

People always think that designers hate each other. And we're certainly a competitive lot, but we also enjoy each other's company. No one else knows what you're going through other than another designer.

The minute it gets to a runway, you're tempted to do some high jinks. I don't want to show something I won't produce. I want people to wear the clothes I show.

It's funny when I hear people complain - particularly about the most fabulous parts of being a designer, like when you're getting ready to work on a show. I don't even know that I'm tired. I could stay up for six days straight! No drugs, no coffee, no nothing. I'm just so excited.

Every woman should own a shirtdress