DD 14 is going to a formal occasion next month and will be wearing a sleeveless dress. It's a short, skater-style lacey dress. She'll need to wear something over the top at least to arrive in. Any suggestions that won't make her look middle-aged? I don't want to spend too much and actually might look on ebay once I know what sort of thing I'm looking for. She's very petite so needs to be careful clothes don't swamp her.