Unit 1: The end of cheap cotton clothes?

An interesting article and video from Sky news suggesting the price of cotton clothes is set to rise

http://news.sky.com/skynews/Home/Business/Cotton-Price-Cost-Hike-Could-Mean-End-Of-Cheap-Clothing-As-Bargain-Chains-Raise-Shop-Prices/Article/201009415743868?f=rss

a) Using a S&D diagram, explain why the price of cotton clothes is due to rise
b) Comment on the staement that low price chains such as Primark may be hit disproportionatelt by this rise in the price of cotton