If rayon is pre-washed before it is made into anything the project won't shrink. I used to make cloths for my girls all the time. I washed the rayon in warm and dried in the dryer before cutting out then once it was made up it could be machine washed and dried. Clothes of rayon bought in the store are not pre washed before being made up, so they have to be dry cleaned. Raayon can have up to 10% shrinkage.