Blue and green swim gives the brightest side of the decision a clear direction. These colors are not interchangeable, so choose based on the mood you want rather than treating blue and green as one general category. Deeper blue feels grounded, while pale blue or green reads lighter.
Color placement matters as much as color family. A bright suit can act as the focal point under a neutral cover-up, or it can be part of a stronger head-to-toe palette. If the shade is already vivid, repeat it only when the rest of the outfit is restrained. If the color is softer, a contrasting accessory can give it definition without overwhelming it. Check the full plan before choosing: a swimsuit that works alone may need a different balance when layered.
Lilias / Tea Green makes a case for a gentle green, while Inika / Pastel Blue keeps the effect cool and light. Neither needs a complicated styling formula. Pick one supporting tone, leave space around the color, and let the suit remain legible as the center of the look. Bright does not have to mean loud, but it should be chosen on purpose.