I dove U352 in the spring of 2004 and the dive shop we used (in Moorehead City) had a similar shirt, that I believe I still have. I wore it around some after diving it, but one time while on a film set out in California, I had to explain it to two producers. They understood, but I told them I wouldn't wear it on set anymore, and in fact I basically put it in my shirt drawer and left it there. It had a larger swastika that was not crossed out. I asked at the shop why they included that, as I'm willing to bet no one on that sub was a member of the NSDAP.