Richa: Interesting question. While I never gave a thought specifically about importance of Search Marketing for textile industry, I would advise you to ask following questions to answer this question yourself:
What are the marketing objectives (short, mid and long term) you would like to fulfill through Search Marketing?
Who's your target audience? Profile them based on their location, gender, age, interest etc
If your target audience is on digital media especially search engines you would like to leverage this medium to fulfill your marketing objectives. Also, I would advice you to search for phrases such as 'sem case studies for textile industry', 'seo case studies for textile industry'. You can replace 'textile industry' with relevant brands. I am sure you will number of interesting examples.
Hope this helps.