maybe alight spray, mist, of water and cover with a teatowel and cool iron it flat.
it extremely is actual that it may be terrific to reknit it in garter sew or rib sew, yetin case you're able to desire to now no longer positioned as much as to try this, or have not have been given time, attempt backing it with a suitable flannel - shrink the flannel a splash greater effective effective than the headband, turn shrink than the side whipstitch all of it aroundthis could help carry it flat.
