Here are a few tips for choosing a swimsuit if you have a skinny frame:

1. Look for swimsuits with details that add volume. Ruffles, gathers, and other details can help to create the illusion of a fuller figure.
2. Choose a swimsuit with a high-cut leg. This can help to create the illusion of longer legs, which can make you look taller and more proportional.
3. Try a swimsuit with a low-cut neckline. This can help to balance out your proportions and draw the eye upward.
4. Avoid swimsuits with horizontal stripes. These can make you look even thinner and can be unflattering on a skinny frame.
5. Consider trying a one-piece swimsuit. These can be more flattering on a skinny frame than a two-piece swimsuit, as they create a more cohesive silhouette.
6. Try a swimsuit with padding or built-in shapewear. This can help to create the illusion of a fuller figure and can provide support and shaping where you need it most.

Ultimately, the most important thing is to find a swimsuit that makes you feel confident and comfortable. Experiment with different styles and cuts to find the one that works best for you.