My favorite summer outfit is a very simple white or grey tee and crisp shorts w/ a bold necklace. Here are some fun pieces that really stand out.
Colorful things: The Warhol beaded necklace by Dana LeBlanc / Smocked silk pendant by Tinctory
Dreamy things: Cloud necklace by Brookadelphia / Color Explosion neckpiece by Star of the East
Fancy things: Red leather and silver necklace by Eninaj / Bubble necklace by Jcrew
Playful things: Swing necklace by Gas Up the Zamboni / Sleuth necklace by Paraphernalia