At last night’s kickoff party for the “Isabella Blow: Fashion Galore!” exhibit (exclamation point an essential part of its title!) at Somerset House in London, guests knew they had one very important job: Wear a smashing, fabulous hat, preferably paired with an equally smashing, fabulous outfit. Anything less would be an affront to Blow’s legacy. Click through our slideshow to see guests in eccentric, whimsical headpieces, including Liberty Ross (in Dior!), Boy George, Grace Jones, and Daphne Guinness.