Today, someone asked about my thoughts on green, eco, conscious, etc, etc. For me its always been,small changes make big impacts. I think you may even find a video blog on causecast.org where I say just that. Combine that with a touch of sustainability (of design) and that's all we can ask for. Of course, there are those than can do more but the above can be achieved with very little change of lifestyle.
In the case of fashion and sustainability - buy a well crafted, classic shape, excellent materials and in the case of a handbag you've got a keeper. Take the Longchamp Cosmos above as an example...