First, I have to say that Von Franz, I would thumbs up your post 100 times if I could.
And I appreciate everyone else's feedback on this too. I can't deny it, the look is a bit precious. My favorite band is Belle and Sebastian, I'm ok with precious. I'm a younger fellow, professional, mid 20's, and I think the style is really suitable for my lifestyle. Full on suits just elicit questions of why I'm so dressed up (casual office, even more casual friends), but everyone I know just seems to intuitively get this look, and what I'm going for, all compliments, no questions. It also helps that the girlfriend digs it.
I get compulsive about certain things. This summer, I only wore neatly pressed white button downs this summer, when whiteshirtmania was at its greatest lull and people professed patterns are back! I'm getting kind of hooked on the Mashburn right now, I want to not only wear it but fully absorb it. Notorious is right, its probably going to come off as affectation at first, but what can you do? The heart wants what the heart wants.
Right now with fashion, I'm ready to pontificate at length about how the rules people make are useless (I really don't care if my tie hits right at the middle of my belt, or a bit above, or a bit below...). That being said, I am seeking the rules of this look, and you all have largely laid them out for me, thanks for that. I want to get them down pat and then proceed to let my own inclinations take over after that. Style is no fun if you don't learn to trust yourself
Going to move on that APC denim soon, Can someone recommend a specific sport coat or unstructured blazer for around $300? I love the Mashburn look, don't have Mashburn money.
Don't let the traditionalists deter you. The Sid look is really stylish and if you dig it, go for it.
Boglioli jackets and suits can be had on yoox.com for attractive prices. Until recently, Sid carried Boglioli in his store. They are minimally constructed and most will fit your desired aesthetic well.