I'm a seventeen year old girl. I'd love to ride a motorcycle. Is it too dangerous? Tell me more about them; is it hard to control the bike? How much stuff can you hold while riding around town?
It's not a safety issue, it's just superstition. There's nothing unsafe about the clothes.
The only German who believed this was Hitler, based on the fact that Calais is the closest part of France to Britain. Senior German generals in the West had worked out that Normandy was the best place for the Allied invasion by early 1944. Rommel wanted to deploy the entire armoured reserve very close to the Normandy beaches from Spring 1944, but Hitler refused to let him. Rommel wasn't at all fooled by Operation Fortitude,the Allied deception plan to make the Germans think that Calais would be the invasion site.