Depending on the craft store, you might only find 10″ rolls or wider. If needed, you can cut down the mesh horizontally as well as vertically. The wreath does look a little bit more frilly.
Cut the mesh into 20" pieces. 36 pieces total – it will take all of both rolls. Use the curl-ruffle method (kruffle) and make two, crisscross them, and secure into each twist on the wreath.