It's the bride's privilege to ask her wedding party to dress a certain way for her wedding. It's tradition. She can tell them what jewelry and shoes to wear, too. She can even ask everybody to wear their hair up, or down, if she's super picky. But she absolutely, positively CANNOT ask anybody in her wedding party to alter their physical characteristics in any way.
Sometimes, technology is a bad thing. Just because you CAN do something doesn't mean you should. That's exactly what went through my mind when I received an email from a public relations company asking me to blog about how wonderful it is that brides and grooms can crowdfund to pay for their weddings now. Are you kidding me?