I thought i'd jump in on this as I've spent 1200 on a three piece suit from AOS. I don't regret it, but my tailor could have made something of similar quality and truly bespoke for about 900, and saved time in the process.
Initially you put in some generic info about your size and body type in the profile section. It includes things like what size neck and waist, etc. Nothing very specific.
Next you spend 1200 on a suit, based purely on a picture on their site. Then you wait 4-6 six weeks.
Then a sample garment arrives in the mail. Mine was a black worsted wool unconstructed, unfinished jacket with a vest and trousers. It was too tight in all areas. You take several pictures in this sample garment, from all angles, and send them back to AOS where Dan (who is great) personally reviews the pics. You also give any feedback you have about the garments fit at that time.
4-6 weeks later your suit arrives in the mail. It is tailored to your body and posture based on the pictures and feedback you provide Dan with. My suit fit well, but still required additional alterations. One sleeve was 1/2" longer than the other. The vest needed taken in, the jacket needed some material adjusted slightly.
You take pictures in the final garment as well, and Dan will take notes and save your final measurements in their system for future orders.
Any work you need to have done to the suit is done by a tailor of your choosing. After you pay for the alterations AOS will credit your account, if you provide a receipt form your tailor.
With all that said, I love my suit. It's gorgeous. But the process is a bit of a hassle. The garment isn't really bespoke and you have absolutely 0 input when it comes to features of the garment. You cannot change lapels, or cuffs or anything about the suit at all. Dan told me personally that this was because he wanted the suits to have a timeless appeal and he personally chose things like lapel width and placement based on the individuals body type.
All-in-all I bought the suit because of Dan. The guy knows his stuff, and must've answered 20 emails from during the process. Also I respect people who are ambitious enough to pursue their dreams and wanted to support his venture.
I'm open to any questions.