Article continues below advertisementBillie Eilish shocked fans over the weekend by wearing something other than her usual baggy ensembles.The Oscar-winning singer, 23, was seen in a friend's Instagram Story where she sported a low-cut tank top instead of her loose-fitting tees and sweatpants.Article continues below advertisementSource: @billieeilish/InstagramBillie Eilish often wears loose-fitting garments on the red carpet.Eilish was spotted in pal Lucy Healey's social media story, where she donned a black-and-white polka-dotted spaghetti-strap tank that bared her cleavage.