Atypical, but not for Tom Parker. It was business as usual.
The behavior though, aside from the dress, could have simply been that he had an issue with death, or that it reminded him of his own mortality, and what fate may have awaited him in the hereafter. Just speculating though.
Or perhaps it was a matter of making a conscious effort to not get emotional or appear affected in any way.
So it could have been a reflection of his being cold-hearted as most would suspect, but the opposite may be possible as well.