Hi there. I've only been learning to dance for about a month, so don't have much experience on the jewellery side of things yet. But, if I were to look to buy something (which I'm going to have to as I have a party in Sept) I would look for a necklace and matching earrings. Light and not to big. Would have to be glittery and silver to match the silver in my costume. With the earrings I wouldn't buy anything that was over an inch in size (I'm the kind of person that believes in 'less is more). The necklace would be delicate, nothing too fancy.
I think I would buy a piece of jewellery to go with one costume because if the neck line is different on a top then using the same necklace may not look right.
