This was the Nazi Luftwaffe's emblem:
This is the current Luftwaffe's emblem:
As for the T-shirt pictured above, you can buy it on this German website for €19.90. Selling Nazi regalia is illegal in Germany.
The shirt did not have the swastika on it, just the eagle. The eagle is the current symbol of Germany. GO to the Reichtstag in Berlin. You will see a three story fierce German eagle.