Had to make a quick trip to buy some thick iron on Vilene this morning - couldn't find my stash!!! - because I'd hoped the bag would stand up on its own but it wouldn't. Trying to incorporate the stiffening into a half sewn bag was a challenge to say the least and really had I known I needed it, I would have ironed it on before I even contemplated sewing. It sort of worked but to ensure it stayed in place, I sewed some of the flowers.
I used some left over material from a quilt I made as a Christmas present and it matched like a dream.