If it's that important, you can make a similar dress yourself, or ask a friend who knows how to sew. ? I'd never pay humongous prices just to have something someone I admire wore. If I really like it, I'd look for something similar that's more reasonably priced. But first, it would have to suit my style and frame.
Before Meghan became world famous for dating Prince Harry, she had the contract with Reitmans for the capsule collections. There have been two capsule collections with lovely reasonably priced clothes. If I'd known sooner, I would have purchased some of those clothes which were wonderful for building a casual, savvy wardrobe. Yep, many clothes and accessories Meghan wears are quite delightful, and it's possible to chart her style evolution. Some of the items she's worn that I love, include the Berardi dress she wore to Harry's polo match in May, the Erdem flower print maxi dress worn when she accompanied Harry to the Inskip wedding, the gorgeous camel coat she was seen wearing for lunch with Markus the day after news broke wide open that she's Harry's gf. And yes, the deep burgundy/maroon color and styling of the dress and jacket Meghan wore to the Invictus ceremony is sublime.
The Telegraph article link provided here earlier stating that the dress is sold out gives a much better view of the dress. Plus, there are more details and better pics on a site called Meghan's Mirror which provides excellent summary details of Meghan's fashion, if you're interested. The site is cool because it's informative and classy, not cheap and not exploitative. I won't link it here, but you should be able to locate it easily. I actually love the way Meghan casually drapes the motor jacket over her arms. It's a perfect accompaniment to the dress because it was probably cool inside the arena, and the dress is sleeveless and low-cut.
Meghan simply has great style, somewhat similar to Diana Princess of Wales, and former First Lady Michelle Obama. Some people are just naturally gifted with an innate sense of style. Sure they soak up all the knowledge they can, and they receive advice from stylists, but they also first just have that special sense of style and grace internally themselves. It's a natural gift that can't be taught, like someone having a natural eye for being painter or a sculptor. You can take classes, sure, but when you have a special gift, you just have it, and it's part of you. I also think that grace, style and ease come with knowing who you are as a person, inside and out.
And my comments are related to the Meghan and Harry relationship in that Meghan being a savvy, stylish person with great fashion sense is a huge part of who she is and why Harry finds her so appealing. For Invictus, she wore brands associated with her adopted country, Canada, and that was not by mistake. It's relevant to comment on Meghan's style in connection to her relationship with Harry, as once they are engaged and married, everything she wears will be commented on and scrutinized (very similar to some of the threads here on what royal ladies wear every week). Obviously, Meghan's wedding dress will be eagerly anticipated. Her savvy, unique style is significant to the fresh appeal she brings to the royal family.