What to expect with your first tail

[Winged Mermaid]

What do the mers do that have larger bottoms and flat stomachs? How do you prevent sagging from happening with the tail from the back to the bottom?

Thank you.

Gapping at the waist is one of the biggest issues with tails. Many just use a belt to conceal it. But there are some ways to get around it. Fabic, use elastic; neoprene use a zipper or a elastic belt (with clasp); silicone tails can have a fitted waist, it just takes more effort to get into the tail getting it past your thighs