Agree. I've never seen him pictured in black. His "brand" for the past decade or more is a blue Brioni suit.
Given the divorce and the fact that his behavior precipitated it, and that he has remarried twice, I think it was a tactful choice not to wear uncharacteristic black so as not to look like he was the chief mourner, and somewhat of a hypocrite, when as of now it was his children and grandchildren's most painful loss.
I'm sure he felt plenty of regret, however. It's all over his face. I hope he was aware that it stirred up his children's pain about the divorce all over again, and unsettled Melania as well. Nevertheless, the clan had the dlplomacy and decorum to unite as a family—ins, outs and all.
Melania is true class. The look an her face is telling. She feels the pain. That is very telling.