CHALLIS, a light, all-wool fabric of almost gossamer texture used for women's dressing gowns and children's suits and dresses. Challis is distinguished from all the other muslin-delaine weaves, of which class it is a member, by the tiny romantic designs in which it is printed. These designs are mostly of 18th and 19th century inspiration and show conventionalized versions of dots, rose-buds, violets and other flowers.