You can fake a butt with hip and buttock pads.
These are usually inserts made from silicone that you can wear.

A corset for every day use may also help to create the illusion of curves.
Kim Kardashian brought a stainless steel one on the market a few years ago. It's a good product.

Another option is to wear push-up bras to create the illusion of cleavage.

In the end , not every woman is curvy.
All those Instagram pictures are heavily edited.

See the filters behind the perfection, I would say.

Spring dress, lose the stomach.

Wear no clothes.