This Gossip Girl photo contains
costume d'affaires, costume d’affaires, bien habillé personne, costume, costume pantalon, tailleur-pantalon, pantalon costume, pantsuit, personne bien habillé, and pantalon de costume.
There might also be
costume, costume de vêtements, costume mou, maillot de bain, costume de mou, and costume trois pièces.
Here are the deleted scenes episode 102 of Gossip Girl, 'The Wild Brunch'. It includes a scene with Dan in the Palce lobby, and a scene with Dan watching Lily & Bart.