Thank you for all your answers.
The company with who I am doing my internship does not have any fashion designer or marketing people. I have to do everything from A to Z. I did made some researches so. Regarding the textile they have fabrics which are made of 2 or 3 layers so you should be warm and dry :-)
I was more think of what you have in your pockets. (e.g: are you taking your Ipod with you? (even if it must not be very safe).
I am getting there so .I think Hey hey
Thanks again for your help.