[She hears his approach a yard or so away, but Saber only opens her eyes and acknowledges Hei once he presents himself. Attire isn't an issue to her at all, she doesn't even take stock of his clothing-- as long as he can fight in it, he could have worn whatever he wished. She has no armor on, herself, as even she will admit that that would be unfair. So it's just her blue dress that she's most accustomed to fighting in, at least far more than her regular suit.
She brushes her skirts off lightly after rising from her seat, and fixes the boy across from her with a neutral, yet studying, look]
...Truthfully, I did not expect you until the very last moment.