[header] How to shrink rayon [title] Hand wash the fabric and soak it in water. [step] Rayon can be easily manipulated and permanently changed when exposed to water. Gently hand wash the garment and let it soak in the water for several minutes to significantly shrink your fabric but also protect the material. 
[title] Wash your fabric in the washing machine. [step] If your rayon garment is much too big, throw it in the washing machine with some regular detergent and wash on a warm or hot cycle.