Why yes, that IS a mermaid necklace!
cardi-Forever 21(similarish here), shirt-J.Crew Factory(more options here), pants-Uniqlo, boots-Zara(similar here), necklace-Betsey Johnson via Le Tote
This silver-striped tunic is surprisingly versatile, you may recall I wore it here with a white blazer. In this outfit it was the starting point for some master-level print mixing. There are several ways to approach mixing prints and patterns in one look, here I based my approach on color: navy, burgundy, and silver/grey. The shirt is the only garment to have all three, hence the basis for the other pieces. True, the sweater sports more of red shade, but its in the same family as burgundy so close enough!