Vintage - At the risk of repeating what many other esteemed reviewers have noted on BN and elsewhere, this is one of the very best.
Essentially it's a powdery amber - dry vanilla, with hints of resins. There's a noticeable citrus / bergamot note in the beginning, hints of orange, and touches of rose and carnation in the mid phases. There's a slight leathery element, but very much in the background for me. I don't think of it as a leather perfume.
What I love most here is how it wears - rich without being heavy, and a very restrained sweetness. It is distinctly dressy, but would pair equally well with smart casual outfit or even something bohemian but well put together. For what it's worth, I find it more versatile than Heritage.
Over the years I've come to appreciate Habit Rouge even more, because of its airiness, and the fantastic blending. One of my bottles leaked a bit during transit, and the residual scent in the package is one of the best things I've ever smelled.
Current (circa mid 2010s) - The mid and the base seem to lack a bit of depth as compared to vintage, and there's a pronounced musky element not there in the vintage version. A fine scent on its own if one has never tried the vintage. Also, a bit weaker.