The Great Gatsby, freshness of clothes

Could you please tell me the meaning of "freshness" in the following excerpt from the chapter 8 of The Great Gatsby?

When they met again two days later it was Gatsby who was breathless, who was somehow betrayed. Her porch was bright with the bought luxury of star-shine; the wicker of the settee squeaked fashionably as she turned toward him and he kissed her curious and lovely mouth. She had caught a cold and it made her voice huskier and more charming than ever and Gatsby was overwhelmingly aware of the youth and mystery that wealth imprisons and preserves, of the freshness of many clothes and of Daisy, gleaming like silver, safe and proud above the hot struggles of the poor.

Thank you.