Joan had a diverse range of outfits this episode.
She starts out in the office in a purple form-fitting dress with a gold tassel necklace, gold bracelet, and gold earrings. It seems as partner Joan has moved past her famous pen necklace and onto more ornate adornments.
To hit the beach with Bob Benson, she wears a sweet nautical themed sweater and skirt, with a red, white, and blue scarf in her hair. Joan would have theme outfits depending on her vacation location. Back in the office the next day, she is continuing her beach theme in a tropical printed suit and a matching gold fan pin and earrings set. The sunny print is a lingering reminder to Roger that she went to the beach with Bob, not him.