Or like me, one can buy a white mutze cap from the bundesmarine for 30€, buy the leaves, kokarde and the kriegsmarine metal eagle for 10$ each or cheaper and make a great u-boat kaleunt white cap. The only drawback is the golden buttons on the side that are different. But barely noticeable!.
Here a link for a original kokarde:
http://www.german-awards.eu/product_...=1513&cPath=42