PURPOSE: To impart a cellulosic fiber structure with a natural worn-out feeling by applying a treating liquid containing a quaternary ammonium base to the cellulosic fiber structure in the presence of an alkali, squeezing the applied liquid, quickly drying the structure to effect the migration of the treating liquid and dyeing the product.

CONSTITUTION: A structure of a cellulosic fiber (especially cotton fiber) is passed through a treating liquid containing a quaternary ammonium base in the presence of an alkali (preferably caustic soda), squeezed, quickly dried to effect the migration of the treating liquid and the uneven application of the compound to the structure. The product is partly cationized and dyed to effect uneven dyeing of the structure and easily obtain the objective cellulosic fiber structure having worn-out feeling in high reproducibility. A fiber structure can be dyed to any color by this process and the product is suitable for casual use.