The Switzerland national flag was adopted on December 12, 1889.
The red field with a centered white cross was adapted from the flag of Schwyz, one of the original three cantons (regions) of the country. It reflects a common flag style from medieval times (square field with cross), and today, only the recognized national flags of Switzerland and Vatican City are perfect squares.
Switzerland Coat of Arms:
Switzerland's coat of arms is an adaptation of the national flag onto a shield.
13th century war flag of the Holy Roman Empire
1420's Swiss Confederate Flag