GRAND RAPIDS, Mich (WOTV) – A DIY mermaid costume is stunning and easy! The best part? It’s inexpensive because you can find everything you need at Goodwill Industries. All it takes is a purple tank top and flowy green skirt. It’s all about the accessories, so try making your own seashell crow. We love this tutorial from Running with Sisters! The steps are clear and concise, plus there’s videos! If you want to add some extra pop to your costume, have fun with your makeup! Use blues, purples, and greens to give you an ‘under the sea’ glow.