I think ethical fashion also means not to steal your ideas from other designers. On that note, Marc is often guilty.
Well steal is part of a process of evolution... if its stealing without adding it's just pure plain stealing but if you do get from one idea to make an evolution its just a natural biological process... to make changes...
"If you can speak what you will never hear, if you can write what you will never read, you have done rare things".
Henry David Thoreau