That color was all over Pitti this year. I like the color, especially on more casual/unstructured jackets, but don't think Piven wears clothes very well. It might not even be his fault as it seems that the designers on the show routinely have him in suits that are way too small. It's painful watching him try and move around in those straight jackets of his.
Actually though his looks more inky. I think that suit is wool from the Dormeuil 365 Amadeus range. I am making one for George Glasgow Jnr right now. He does live in Miami.