You can easily see the resemblance here:
On the left: Saber from Fate/Stay Night, on the right: Violet Evergarden
And her usual blue outfit is somewhat similar to saber
On top: Saber from Carnival Phantasm, on bottom: Violet Evergarden
Note that the original violet didn't have the ahoge, it's edited on her first picture here with her blue necktie. So is Violet design inspired by Saber from Fate Series here?