The Engineers Home Planet

I was looking at the image of the Engineers and started thinking about their clothing... It looks as if it is cotton and they have a rope styled belt a metal pin.....holding the cape and a neck decoration that appears to be made of fibres.... [img]http://doubleonothing.files.wordpress.com/2012/07/prometheus-elder-engineers.jpg[/img] [img]http://www.prometheus-movie.com/media/prometheus_engineers_deleted_opening_scene.jpg[/img] I began wondering whether we could start working out what their home planet looks like by working backwards from these clues....as you would with forensic evidence... so...cotton and plant fibres....... does that mean their planet has plants ? and what is the Vial made from that holds the goo?? clay...wood..plastic? There is the large circular spaceship and the juggernaut etc etc the material used to build these may have come from thier planet? We know they are carbon based ....what about the atmosphere of their home planet...do we know when they needed their suits or not to breath?? they seem to be able to breathe naturally on Earth?? so oxygen??