Is anybody here an expert on Luna Love good? I need ideas!

Well, you could try to assemble a costume that is specifically described in the book, such as Luna's sunny outfit at Bill & Fleur's wedding, or you could just go with a general look - either school or home!

You need robes either way. You could go with Hogwarts robes (which you can find at some costume shops), or just basic "home" robes that wizards would wear. Then just kind of ... have at it! Haha - Luna loves colors and things with personal meaning (like her radish earrings), she also likes handmade things (again, like the earrings)! My understanding of the Hogwarts uniform is that they wear their own clothes under their school robes, so don't worry about making that perfect movie school uniform if you don't want to!

So throw on some bright colors and robes and wear jewelry that looks or is handmade! Aside from that I guess you should make sure you have a wand (keep it behind your ear) and perhaps some sort of fun school bag if you're going with Hogwarts Luna.

You could also make a fake Quibbler to carry around (just noticed that the person above me mentioned this too) - make sure it's upside down when you're reading it! :]

my guess anything (in a word) unnatural, crazy, dont forget ravenclaws colors um and hey print a fake quibler for props

Blonde wig, light blue contacts, wand, ravenclaw robe. U can get those at Universal. U can also get the glasses whe wore. I forgot what they were called, but she was wearing them when she first met Harry Ron and Hermione. And, of course, the upside down Quibbler. Oh, and you could carry around a fake rabbit for her patronus.