Cassie Howard’s bridal gown on Season 3 of “Euphoria” has it all — and in this case, that’s not exactly a compliment. HBO Cassie Howard’s wedding dress is as outrageous as the character herself. The third episode of “Euphoria” Season 3 sees Cassie (Sydney Sweeney) finally marrying Nate Jacobs (Jacob Elordi), with the bride walking down the aisle in a custom Wiederhoeft gown with a curved corset, thigh-high slit, voluminous train, dramatic veil and plenty of sparkle. “It felt like it should be really over the top and have probably one too many features — in a way that you could tell her character has such a strong grip, but also is losing her grip at the same time,” designer Jackson Wiederhoeft told Page Six Style exclusively of the “princess-like dream dress,” the biggest their brand has ever created. Jackson Wiederhoeft was behind the design, telling Page Six Style exclusively about the vision behind the “massive” gown that took them more than a year to make.…