Auntie Of The Birthday Mermaid Girl Tee. Funny Mermaid Auntie Family Matching Clothing Gifts. Mermaid tail costume for your Auntie to wear at a mermaid themed birthday party or Halloween top shirt. This mermaid Auntie birthday party decoration graphic apparel design makes a perfect mermaid girl's birthday gift idea. Cute mermaid b-day outfit for mermaid Auntie and beach lovers who love mermaids and other mythical creatures of the sea. Lightweight, Classic fit, Double-needle sleeve and bottom hem