Flag of Switzerland The use of the Swiss flag or coat of arms on merchandise is technically prohibited by the 1931 Federal Act for the protection of public coats of arms and other public insignia, but that prohibition is not enforced. The Red Cross symbol used by the International Committee of the Red Cross, a red cross on white background, was the original protection symbol declared at the first Geneva Convention, the Convention for the Amelioration of the Condition of the Wounded in Armies in the Field of 1864. According to the ICRC the design was based on the Swiss flag by reversing
Flag of Switzerland as the cross arms, so that the total height of the cross is fixed at 20:32 = 5:8 of the height of the flag (in other words, the width of the margin is 6:32 = 3:16). This ratio is also given as a "vexillological recommendation" in the flag regulation used by the Swiss Armed Forces. Flags with a cross of larger relative widths than the prescribed 20:32 = 62.5% remain in wide use; common ratios include 20:26 ≈ 76.9% and 20:28 ≈ 71.4%. For the ensign, the ratio of the size of the cross to the height is likewise 5:8,