I still like the high-collared ones best, even if they're both black. Don't your parents want you to have anything with colour? Even a little colour?

Maybe you could get a corsage. My mum makes some corsages that stay on without getting pinholes in your robes - and they open themselves during the evening, you know, so they don't ever get all wilted before the night's even half over. You should ask your mum to see if she'll make you one.