Haven't RTFT, so apologies if this point has been made already:
One potential pitfall of a tailored, structured outfit is that most people buy them ready-to-wear. So not actually "tailored," except to a bog-standard set of measurements decided by the manufacturer. It's probably not going to fit you that well or look that good - unless you take it to a tailor and have it altered, which hardly anyone does. Even then, it's unlikely to be as good as something which was actually made for you.
This is one of the reasons why members of the Royal Family tend to look a lot better in that type of outfit than most people. Because their clothes have actually been made to fit, and to suit them.
In the past, people would own fewer clothes, but they'd probably fit better, because dressmaking skills and made-to-measure clothing were much more commonplace. Now we're trying to replicate that structured look with a lot of off-the-peg MOB/MOG outfits, but it doesn't necessarily end up looking that good.
So a softer silhouette can end up working a lot better. OP mentions that this particular dress fits like a glove, which in itself is something that will really elevate her look.