with such an air

[suprunp]

The carriage was ordered for five o’clock and at ten minutes to, the countess, dressed for her drive, sent for José. When he came into the drawing–room, wearing his pale grey livery with such an air, she could not deny that he was very good to look upon. If he had not been her own coachman – well, it was not the moment for ideas of that sort. He stood before her, holding himself easily, but with a gallant swagger.
(W.S. Maugham; The Romantic Young Lady)

With such an air of what?

Thanks.

 

[5jj]

Just - 'an air'. From the context we can imagine that it was the air of a gentleman rather than that of a coachman.