Final answer:
In 'The Office' S3E15 'Phyllis' Wedding', Michael Scott breaks wedding guest etiquette by wearing white to Phyllis' wedding.
Step-by-step explanation:
In the The Office Season 3, Episode 15 titled "Phyllis' Wedding", it is Michael Scott, played by Steve Carell, who commits a fashion faux pas by wearing a white suit to the wedding. Wearing white as a guest at a wedding is traditionally considered a breach of etiquette as it can be seen as an attempt to upstage or draw attention away from the bride on her special day.