Being a manager of a textile company how he can get a competitive edge/advantage over your competitors?

Either produce a product that is noticeably superior to your competitors, or produce a comparable product to theirs but that costs less. This should allow you to increase market share, but will likely reduce net gains per unit of product. Once you have decided on a course of action you need to let your customer (and potential customer) base know that you are either better or cheaper. This will further cut into your net.