The details non-adjustable straps, square neckline. This is a lightweight drapey crepe fabric with a dry hand feel - 53% viscose, 47% rayon. Dry clean only. More on fabric & care. Fabric This is a lightweight drapey crepe fabric with a dry hand feel - 53% viscose, 47% rayon. Viscose – aka rayon – is a man-made cellulosic fiber made from wood pulp. We’re committed to ensuring all our forest-based products come from sustainably managed forests. That’s why we work with the non-profit group Canopy to help drive positive change for all our forest products. Care Dry clean only.