When tempestuousness cries foul at the baseball game

Much to her surprise, the underwear she purchased was exactly three shades off the colour she had originally intended to purchase. As she went ahead with it anyway, it became significantly less surprising.

Much to his surprise, the underwear he purchased was exactly three mm off the size that he had originally intended to purchase. As the difference in size was so minimal, it became significantly less surprising.

That he and she were purchasing underwear together and at the same time was a surprise to both of them.