Alice from SAO is actually based on Alice in Wonderland, not King Arthur or Saber from Fate.
As for the armor, all the knights in SAO wear that armor, not just her. Each Knight has a color and hers is Blue and Gold. Saber wears silver armor with blue accents, so the armor doesnt even match.
And for the swords, they are quite different fundamentally. Saber's sword is Excalibur aka the sword in the stone. Alice's sword is an Apple Tree turned into a sword, a wooden sword.
Armored Skirts are not something Fate created at all.
Alice (SAO) is though to be based on Alice in Wonderland and characters from late 90s JRPG games.
And SAO starts before the release of FSN, although the Alicization arc started a year after the release of FSN this was her original appearance: