Festival: Matched sets, a Theme?

It’s funny: I assume photographic evidence is forthcoming, but Pamuk and Rushdie were similarly dressed — striped, light blue dress shirts and dark pants.
Saunders and Foer were likewise similarly dressed. Both had lavender- or lilac-dominated tops (in Saunders’s case, a tie) and jeans. Their clothes matched the backdrop.
Are these panels being costume-designed? Is “costume-designed” even a word?