I think she's breathtaking in that photo with the gorgeous clear skin and blue eyes. Yes, it's not exactly contemporary clothing, but she is marrying into a conservative house and I sense that fashion will have a fairly low priority for her. And that's to her credit.
Let's face it. She will probably never be joining Kate and Charlene on Vanity Fair's Best Dressed List. Heck, even Mathilde Brabant has made that list in the past. But Stephanie Nassau? Nope...can't see it.
BUT...she has gotten a tiny taste of haute couture and what it can do for you. Unless she is deaf and blind she is aware that her bridal outfits have gotten her rave reviews in the international press. Maybe that will encourage her to abandon the unflattering and frumpy outfits.
The fact that she is now the wife of a man with access to millions of dollars doesn't hurt her case either. Maybe designers will send her some nice things to look over, and her mother-in-law can continue to offer guidance.