I hadn't noticed because of the everything else happening in that scene, but Buck seemed to have opinions about Hen's outfit (good for him that he got distracted and didn't say anything because she would have killed him on the spot)
"Mr. Newton, we at the Royal Society regret to inform you that Mr. Hooke has suffered an unfortunate accident involving a runaway carriage and a grand piano and, well, needless to say, he will not be joining us at our meetings for an indeterminate amount of time."
Newton:
"Oh no. That's terrible. Please send Mr. Hooke my regards."