Its not difficult to engineer a bit of safety into a cape. The clasps holding the cape around your neck/on your body can be designed to have a low breakaway strength to prevent strangulation(150N is a typical force). This is a feature designed into most safety helmets. Its secure enough to never fall off unintentionally, but weak enough that it removes the risk of strangulation.
Its not difficult to engineer a bit of safety into a cape. The clasps holding the cape around your neck/on your body can be designed to have a low breakaway strength to prevent strangulation(150N is a typical force). This is a feature designed into most safety helmets. Its secure enough to never fall off unintentionally, but weak enough that it removes the risk of strangulation.