John Lofgren Monkey Boots Shinki Horsebuttt - $1,136 The classic monkey boot silhouette in an incredibly rich Shinki russet horse leather.
Grant Stone Diesel Boot Dark Olive Chromexcel - $395 Goodyear welted, Horween Chromexcel, classic good looks.
Schott 568 Vandals Jacket - $1,250 The classic Perfecto motorcycle jacket, in a very special limited-edition Schott double rider style. I can see how horizontal pieces, yokes, etc or even middle/side pieces can help with the back shape, but not a single vertical seam.
Just reviving this thread to update what I ended up with. Found very close to what I was looking for in this at Wested. Figured it was worth the risk/reward as I've heard generally positive things about their stuff. Understanding it's not in the same playing field as Aero or other favorites here, it's a very nice jacket for the price, that fit what I was looking for. In fact I'm also thinking about trying out Wested's custom services on the Bond London jacket from Spectre (John Varvatos Racer Suede replica).
With that said, I'm also browsing second-hand schott/aero/etc for a more traditional brown leather jacket on the next purchase.
I'm neither a tailor nor a cutter so lack the ability to describe it well, but it's to do with the fit over the shoulders and the horizontal curve of the back. The Aero Board Racer has, in the original patter by design, a vertical seam in the middle of the back. They do make them with a one piece back by request as a lot of people still want that, but they're clear that for those who want a very neat fit, like the 'racing shirt' it's patterned after rather than a jacket per se, the angle won't be right for the full form-fitting effect without the seam there.
Slight digression but it’s a bit funny how many TFL debates about fit and patterning are easily settled by a few minutes’ conversation with a tailor or shirtmaker.
For instance, the infamous “Aero lines” are a result of forward shoulder points on a readymade pattern that clashes with them. Someone with forward shoulder points will see those lines on shirts, leather jackets, nylon jackets etc (unless bespoke) while perhaps having no such issue in his suits, because even a readymade pad solves the issue whereas the former garments are not made with padding.