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Wiktionary
emperor's new clothes

n. (context idiomatic English) Something obvious and embarrassing that is politely ignored or that goes unacknowledged.

Wikipedia
Emperor's New Clothes (song)

"Emperor's New Clothes" is a song by American rock band Panic! at the Disco released as the third single from the band's fifth studio album, Death of a Bachelor, on October 21, 2015 through Fueled by Ramen and DCD2.

The song was written by Brendon Urie, Jake Sinclair, Lauren Pritchard, Sam Hollander and Dan Wilson. It was produced by Jake Sinclair. The music video for the song was uploaded to YouTube the day of its release, and serves as a sequel to the music video of " This is Gospel". "Emperor's New Clothes" was nominated for Best Track at the 2016 Kerrang! Awards.

Usage examples of "emperor's new clothes".

He had first heard his mother read him the Emperor when he was a small boy (obviously thinking of the 19th Century children's classic, The Emperor's New Clothes, by Hans Christian Anderson).

He did not glance at the furniture, the emperor's new clothes that had been no more than an illusion, but left the flat almost unseeingly.

Nothing but the truth of the rationality of the unconditioned mind gives such power to the ever-popular story of the emperor's new clothes.

It was the emperor's new clothes: people laughed because they didn't want to be seen to be not 'getting it', Simone among them.