I was recently browsing through dresses and found that Cooper St is now featuring size-by-size garment measurements in the details section and I was so beyond happy. I rarely buy dresses online, as my bust fits a normal size 10, while my waist and hips fit a normal size 6-8 so I usually have trouble finding the right fit. The Iconic returns process does make it fairly easy to buy/try/return/exchange but finding these exact measurements (as opposed to estimating the appropriate size off the general size guide) was a massive answer to a concern I've had for a while.
The website does make it fairly easy to find the correct size - but I would LOVE to see more specific measurements on more products (particularly dresses) if possible!