how to make hard jeans soft and vice versa

anyone knows how to make soft jeans hard, is i use starch? i want to make permanent hard and hard jeans permanent soft. how?

permanent hard= super glue
permanent soft= fire

starch cannot lar...u wash liao den soften oreadi...but actually..i have to idea wat to do oso Laughing

i think the best way is to wear it more often to “season” it