The tag is warranted, since Ryuuko in a wedding dress is a reference to spoilerRagyou brainwashing Ryuuko with, e.g., "marrying" her to the Life Fibers/spoiler
The only things similar is that it is a shoulderless dress and has a veil. Besides the obvious color difference, this design is more open in the front, the veil lacks the tiara like part, there are no bridal gauntlets, there isn't a necklace, and this one has a choker.