WordNet sense 1 (treated so as to be easily or quickly washed and dried and requiring little or no ironing):

wash-and-wear

WordNet sense 2 (capable of being washed without injury):

washable

WordNet sense 3 (used of fabrics that do not require ironing):

permanent-press

WordNet sense 4 ((of linens or clothes) not ironed):

wrinkled, unironed