The alternating white and blue stripes are mentioned to signify the nine syllables of your phrase "Eleftheria i thanatos" ("Independence or Demise"), a favorite motto over the Greek War of Independence. Over the Kingdom of Greece, a crown was added within the centre on the cross. Using cloth banners outdoors https://custom-medieval-banners-a70626.blogolenta.com/30174066/not-known-factual-statements-about-medieval-banner-designs-sprial