Trick or treat bags to match costumes

Grandkids asked for trick or treat bags to match their costumes, Mario and Princess Peach from Super Mario. My Daughter asked if I could make them a little bigger this year, and if I could add zipper, because they used their bags from last Halloween all year long to carry things when they go off roading, or to spend night at Grammy’s house. I used ultra stiff Pelion fusible web which makes them stand up nice, but it was really difficult to turn bags inside out through lining because of the stiffness.