Currently the Bretonnian Longsword model (which is also used in the Bret. Sword and Shield weapon) has the same blade length as the “normal” Sword and Shield weapon.
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Bretonnian Sword and Shield:
Imperial Sword and Shield:
Since the Bretonnian Longsword is based on the historical European Longsword (which was in fact a purely two-handed sword) and carries the name
bastard_sword (which is a so called one-and-a-half-sword) in the code, I argue that the blade should be a bit longer than the “normal” sword of the Sword and Shield weapon.
It should have a length between the Imperial Sword and the Greatsword, here are some quick mockups.