Here are some Life magazine pictures of a "breakaway dress." It's cute, but probably not as much fun as, say, a tear-away dress, an edible dress, or a tattered dress.
Daliah Lavi Ali MacGraw Barbara Leigh and Susan Kiger Bethel Leslie Chan Poh Chu Ellen Drew Eva Bartok Jill St. John Joan Collins Julie Adams Katharine Ross Lana Turner Linda Evans Marsha Hunt Mylene Demongeot Nina Foch Joan Marsh (maybe) Rhonda Fleming Tuesday Weld Virginia Bruce