The Australian Open has long been a sporting spectacle, but this year it has emerged as one of the most influential fashion moments on the global calendar. The Open’s late-summer timing gives fashion forecasters a rare first look at trends before traditional fashion weeks take hold. But with all the rules and dress-codes that make up attending other grand slams (think tailoring at Wimbledon; smart athleisure at the US Open; European minimalism at Roland-Garros), what does Australian Open style look like? Some of the most talked about on-court fashion moments from last year, for instance, was women’s world no. Tennis WAG Morgan Riddle (to American player Taylor Fritz) has helped redefine tennis style at the AO.