Granted, I'm not a huge fan of the idea either. The coat does contribute to the look, but I also remembered a few shots in the movie where Gosling reminded me of Indy back in Nepal. I don't really know why, perhaps it's just wishful thinking, but it's undeniable that there's at least a tangential resemblance between the two actors.
Edit: You know what? It might really be that coat he's wearing that suggests such a strong resemblance to Harrison.
But then there's this. He resembles like ToD Indy in this one, definitely.