Most Memorable Dresses: Geri Halliwell’s itsy-bitsy “Union Jack Flag” Dress paired with platform red boots, worn while performing with the Spice Girls at The BRIT Awards in 1997. Halliwell originally was given a mini black Gucci dress to perform in but she thought it was too boring and wanted to celebrate being British. She asked her sister to stitch on a Union Jack tea towel to the front as a patriotic gesture. A peace sign was sewed behind the dress. It has since become one of the most iconic dresses in the last 50 years, beating the likes of Marilyn Monroe (Seven Year Itch Dress) and Princess Diana (Wedding Dress).