Wow, people have really beautiful accessories!
Here are two of mine- not as stunning as the jewelry, but I'm a practical kind of mer

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The belt used to be a fugly all-black scuba dive belt.
It's now dark green, with stuff sewed on, and neon green netting to let the water flow from the three compartments.

The bag is a really tightly woven net, which I usually attach to the diving belt.

I also have lots of necklaces and armbands not photographed yet;
my resources to make them are a bit limited though, since I won't use real animals.