A few reasons....
1) People are interested in doing what's right for the environment. One of those things is buying clothing made of environmentally friendly cotton - organic cotton. Organic production systems replenish and maintain soil fertility, reduce the use of toxic and persistent pesticides and fertilizers, and build biologically diverse agriculture.
2) Organic cotton is widely being embraced by holistic practitioners as having a healing or positive energy, which can benefit people - especially those suffering or recovering from illness. Many with chemical sensitives are finding organic cotton therapeutic. Just an FYI - cotton is the most heavily pesticide-intensive crop grown in the United States - and we wear it everyday!
3) Buying organic cotton helps support those organic farmers who choose to follow organic practices, such as avoiding the use of toxins, synthetic fertilizer, harsh chemicals, bleaches and dyes. Instead, organic farmers rely on natural fertilizers, compost and soil amendments. Those chemicals are taking a toll on the environment.
Think strongly about buying organic cotton in place of regular cotton. How can you argue against it??