I have an H figure

Your shoulders and hips are the same width and your waist is not marked. For the purchase of a two-piece swimsuit, you usually take each of the two pieces in the same size.

The trick to follow
Refine your waist and redefine your curves!
Adopt the 2 pieces that will break your androgynous silhouette.

Advice from Mademoiselle Bikini
For the bikini top: Add volume with a push-up, a balconette or a triangle top with foam padding. Tied in the neck, it will highlight your shoulders and break the "rectangle" side of your silhouette.
A top with ruffles, fringes will give relief to your chest.
For bikini bottoms: choose retro-style high-waisted panties, or enhanced with a contrasting or non-contrasting belt to mark your waist. A swimsuit with bows or ruffles on the sides will flesh out your hips.
For the 1-piece swimsuit: Choose a model that has been worked on at the level of the cut and the straps, this will allow you to feminize the look and mark your size.

To avoid: Avoid swimsuits with square necklines, bras and horizontal stripes.

Top : Nectarine Seafolly Soft Cup Halter Swimsuit
Bottom : Seafolly Goddess nectarine bikini bottom

Top : Banana Moon black push-up bikini top
Bottoms : Banana Moon black bikini bottoms