So I was just browsing PoshTots with Halloween in mind, and this is the most expensive costume they have (although they are offered year-round, not just during Halloween). This dress is a mess of sequins, satin, lace, pearls, and tulle. It doesn't have to be for Halloween, it could be appropriate for a birthday party or even a wedding. I just don't think I'm wowed, especially because this dress boasts a $650.00 price tag. For costume purposes and for the price, I would definitely go with PoshTots' mermaid costumes.