Whats the smallest ensign I can fly

I once designed a courtesy flag around a scotch pad because that was the only green material I had on the boat .
at a distance it looked… ok
 
On topic of flags I see an offer from the suitably named Privates Cave just arrived in my in box for platinum jubilee bunting and maybe the op would be interested in investing in a set. Has anyone actually bought any jubilee bunting or flags to dress overall?
 

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