Annette Funicello and Frankie Avalon in ‘Beach Blanket Bingo’
The beach party film series (think High School Musical in the 1960s) starred Annette Funicello and Frankie Avalon traipsing around in quintessential '60s swimwear, though it almost wasn't so: Walt Disney, who still had Funicello under contract after her stint on The Mousketeers, reportedly would not allow her to appear in the film if she donned a bikini. Eventually, he settled for an "anti-belly button clause," permitting her to appear wearing a two-piece that covered her navel.