Thanks for the comments and the thumbs!
I think it's time to quote the great Sheepy.
Now it's Sunday.
I think with a sky blue shirt and a pocket square it will look even better. But as it is, it´s a real good start here.
I have two 4x2 DB sports coat. In the german styleforum the people said, that 6x2 looks better on me, but I give the 4x2 DB an other chance tomorrow.
A white shirt is for me too formal for that blazer with patch pockets and the monkstraps.
And on the second look I see that the blazer is a little bit too short.