FYI, I took the plunge and ordered a 3-button suit much like the one pictured. The photo is of a suit in TAT's "standard" medium grey wool. I went with the "upgraded" medium grey wool, which is better quality, a bit more lightweight, and a slightly lighter colour. Aside from a few details, my order is otherwise the same as the photo. I'll be sure to post pictures when it arrives.
Thanks for all the advice everyone!