Alicia Keys, Katy Perry, Kelly Rowland and Jennifer Lopez were among the artists who wore low-cut gowns accentuating ample cleavage and/or dresses with thigh-hit slits as they walked the red carpet before the ceremony.
Deadline.com said last week CBS' standards and practice division emailed Grammy attendees regarding acceptable attire for the televised gala.
"CBS Program Practices advises that all talent appearing on camera please adhere to network policy concerning wardrobe," the network's email message said.
"Please be sure that buttocks and female breasts are adequately covered. 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. Please avoid sheer see-through clothing that could possibly expose female breast nipples. Please be sure the genital region is adequately covered so that there is no visible 'puffy' bare skin exposure. Please avoid commercial identification of actual brand name products on T-shirts. Foreign language on wardrobe will need to be cleared.
"OBSCENITY OR PARTIALLY SEEN OBSCENITY ON WARDROBE IS UNACCEPTABLE FOR BROADCAST. This as well, pertains to audience members that appear on camera. Finally, The network requests that any organized cause visibly spelled out on talent's wardrobe be avoided. This would include lapel pins or any other form of accessory," the message said.