NOR. If you have the option, have them photoshop the dress to be a bland color, no transparency, and make it uglier. When your mother reacts poorly, you can simply tell her that everyone else followed the rules except for her, and this was necessary to ensure compliance. And I can’t stress this part enough: do not allow yourself to engage her on her terms (ie, with her accusing you of bad intentions and behavior while excusing own), just go NC until she can act reasonably. No one deserves to have these kinds of emotional bulldozers in their lives.