This is a local flag which is mostly used for clothing but surprisingly spotted being used a flag by Fishermen.
<a href="//commons.wikimedia.org/w/index.php?title=User:Ainoo_Charles&amp;action=edit&amp;redlink=1" class="new" title="User:Ainoo Charles (page does not exist)">Ainoo Charles</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>