This actually stems from a discussion I was having with my sister about her daughter (18), who is very concerned about Halloween already. Not only is she trying to lose weight (which I think might be a bit unhealthy for a girl her age, but that's another subject entirely), she is looking at buying adult costumes (that's the site she's looking at) which I don't think are quite appropriate for a girl her age. She's not my kid though, so I can't really tell her what to do... but as someone who is concerned for her niece, what should I do?