Kaamil Shah, a 22-year-old student of King's College Cambridge, sparked a frenzy on Twitter with the hashtag "#vestgate" after he appeared on BBC's 'University Challenge' this week.
The academic show, hosted by Jeremy Paxman, is known for its no-nonsense and serious approach.
But Shah's family has come out in support of his unconventional dress code choice on the sombre show.
"The family are proud of his achievements and we are having a laugh about it," his brother Haaris told 'Evening Standard'.
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"He has always dressed like that - he is a real character. Our mum found it very funny. He was very upset about losing and his own performance but the family think he did well," the 19-year-old added.
London-based Bhavik Shah, whose wife is related to Kaamil's father, said, "Compared to what everyone else is wearing it is quite out there, admittedly.
"The general feeling among the family is that he looked great and we are proud of him. I am yet to hear exactly what his mother and father think, though. He was almost certainly attempting to make a statement. He was trying to bring the show into the 21st century".