Tail Appreciation

One of my favorite little details about the show is the little spines/ridges on the backs of the girls’ tails. Ofc I know practically these were probably just there to close/seal the tail costume around their legs, but in universe it really adds to the magic. It really strengthens the fishy vibe to their mermaid bodies. I wish the girls’ little fish spines were more prominent, just to really enhance the inhuman feel a little bit more.

What are some of your favorite little details about the mermaid outfits that maybe go unnoticed by most people?