If you are using a template and sewing them they may be different. I just fold mine a bit more and they stay that way permanently unless smooshed in a book or backpack. In that case I unwrinkle by dryer. I just toss them in with a static sheet or socks
If you go w/stiff stuff you can also use glue and water. It's just reg old elmers and water. Half and half from spray bottle and you can dip or spray.