G13, National Letters Ambroise Johnson Z-88 “As discussed during our Swiss Annual Meeting, please find below the submission allowing a National Flag to be displayed at the bottom edge of our sails. The proposal allows the sailors to display their Nation Flag in addition to the National Letters by adding at the end of the article
G.13 the following text: ‘ A national flag with a maximum size of 567 x 337 mm may be applied to both sides of the mainsail such that the aft edge of the flag is 100 mm from the leech and located between the lower and the second batten pockets. The flag shall not touch the race numbers. The flag shall be printed on separate material applied to the sail. The national flag shall correspond to the national letters.’
This text is largely inspired from the ILCA (Laser) Class Rules 4.h and of the definition https://en.wikipedia.org/wiki/National_flag. Considering that we sail boats, one may argue that this would be an ensign rather than a flag.
I hope you can answer in a few days to complete our task.