Summer Essential: 1 The Swimsuit. Consider the shirts you pair with your swimwear. A pattern down below pairs best with a solid T-shirt, while a solid on the bottom allows you to mix in a pattern or a different bright hue (for color-blocking) up top. A great swimsuit adds a cheerful edge to your wardrobe. Ground these colorful fabrics in a classic silhouette: Baggy styles and long lengths should be swapped for traditional shorts that are trim and rise just above the knee.