Summarize this article:

Linen, cotton, and chiffon are all thin, lightweight fabrics that create a breezy, effortless vibe central to the California girl look. While some of these fabrics are common because of their ability to breathe in California heat, they are all extremely low maintenance and easy to care for, lending to the laid-back vibe essential to California living. Linen and cotton tend to shrink, so you may have to size up. If you size up and your clothes don't shrink, don't worry! A slouchy silhouette is a hallmark of California style. California girls are known for their denim bottoms, whether that means a pair of distressed denim jeans, a pair of cut off shorts, or a short denim skirt tossed on over the day's swim suit.  Dark jeans are better for more formal occasions, particularly if they are paired with a nice heel. Distressed jeans are popular for California girl style, and can help create a breeze in hotter weather. One of the best and simplest elements of California girl style is the laidback approach to footwear. Tennis shoes are seen on everyone, everywhere. Instead of being used primarily with pants and a tee, sneakers are considered great footwear for pants, shorts, skirts, and dresses, and are the perfect way to dress down a dress or skirt.  Sneakers look great with a pencil skirt and a tee tucked in halfway for a simple, but put-together look. Clean white sneakers are great when paired with a pair of sleek, dark jeans and a bright peplum top. California is known for two things: heat and sunshine. To play up the sunny atmosphere of California, California girls are known to wear bright, happy colors, ranging from  bright fuchsia to a sunny butter yellow. You can wear colors in large spaces, like a brightly-patterned sundress, or add a pop of color with a bright scarf or pair of shoes.  If you are nervous about adding bright colors to your wardrobe, start with a purse or a hair scarf. Using several different colors in a single outfit is one way to immediately stand out with Californian style.

Summary:
Wear thin, lightweight fabric. Wear denim bottoms. Make sneakers your go-to footwear. Use bright colors.