Lalamira.com

Some caution is warranted for ordering from Chinese-based companies. They often are cheap imitations of designer gowns. One thing that can be helpful is to search the image to see if it is their original picture or "borrowed" from another website. It seems a bit safer to find a more conventional website. you might get sale dresses at bhldn or get reselling of dresses on stillwhite. There are some other reputable low-price gown sites too (if price is part of the concern) with styles that might be similar.

With the Microsoft Edge browser, you can find a square icon at the top right corner of an image, if you click on that, you can locate similar images. If the image is a copy of another designer, you may find that designer with that browser feature.

That Princessly site is also a bit similar to other sites which borrow images. This picture is at least as old as 2012 as found under a link starting with jessicamaybridal