Fifteen of Whitney Houston's gowns and dresses to hit the auction block Nov. 21

NASHVILLE , Nov. 11 (UPI) -- Fifteen gowns and dresses that once belonged to the late pop-music star Whitney Houston are to be auctioned off Nov. 21 at Nashville's Gaylord Opryland Hotel & Resort.

Stevens Auction Company said the frocks were worn on-stage and to various glitzy galas. Also up for sale will be some of Houston's personal effects, such as pins, costume jewelry and other accessories.

"Ms. Houston's 15 dresses and gowns are in pristine, like-new condition. All of them were important to the late singer's career and the public will be viewing them for the first time since she wore them and they went into storage. Perhaps the most important one of the group is a gold and white dress designed by Bob Mackie. All the dresses, though, are seen as highly collectible," a news release noted.

Houston accidentally drowned in 2012 in a Los Angeles hotel bathtub after years of drug abuse. She was 48.

The Grammy Award-winner's only child, daughter Bobbi Kristina Brown, died under hospice care this year at the age of 22. Brown had spent several months in a coma after she was found unresponsive in her bathtub in her Georgia home. The circumstances of Brown's death remain under investigation.