While celebrities in flashy and revealing clothes have become a part of every award show, CBS has made it clear that the network wants musicians attending the Grammys award function on Sunday to cover up.

CBS’ Standards and Practice Department sent out an email to musicians advising them to keep their breasts, buttocks and genitals under wraps, as “obscenity or partially seen obscenity is unacceptable for broadcast,” Deadline.com reported.

“Please be sure that buttocks and female breasts are adequately covered,” a copy of the email obtained by Deadline.com read. “Thong type costumes are problematic. Please avoid exposing bare fleshy under curves of the buttocks and buttock crack. Bare sides or under curvature of the breasts is also problematic.”

Also, musicians have been asked to avoid sheer dresses to avoid any sort of wardrobe malfunction. Clothing with visible brand names and those featuring political slogans are also a strict no-no on Sunday’s award night.

This warning is issued as part of CBS’ attempt to stay away from court battles for broadcasting indecent images. Back in 2004, the network was fined $550,000 by the Federal Communications Commission for broadcasting Janet Jackson’s nipple slip during her halftime performance at the Super Bowl.

And though CBS expressed “deep regret” for the incident, celebrities continued to be daring in their wardrobe choices. For instance, Pink performed an aerial act in 2010 dressed in a nude bodysuit that left little to the imagination. Similar was the case with the plunging neckline backless gown Rihanna wore last year to the awards night.

While celebrities are yet to record their reaction to the “Wardrobe Advisory,” comedian Joy Behar took to Twitter saying she watches the Grammy’s only for the wardrobe malfunctions. She tweeted: “Grammys are insisting that no breasts, butts or genitals be exposed during the show. Seriously? I only watch for the wardrobe malfunctions.”

Media professional Sabrina Sabbagh concurred, tweeting: “Notify the prude police. CBS has issued a memo asking stars to cover up at the #Grammys. Why even watch if there's no side boob potential?”