Glad you asked...
Polyester should be put on a gentle cycle. Use cold water, and without a long spin cycle. Don't tumble dry. Hang to dry and use an cool iron for wrinkle. You can find more information here: http://www.margshighlanddancewear.com/pr...
Then again, this answer might help you...
Check the label on clothes that are 100% polyester. Many will say 'dry clean only'. If the label doesn't say that it is safe to watch the garment in cold water on a gentle cycle. You can also safely dry it on a low dryer setting.

