First, it's important that you read Twilight by Stephenie Meyer. Throughout the novel you will find tips about Bella's style and the way that she carries herself. She is very clumsy but holds herself well. As you will learn from the series, her favorite shirt is her plain red t-shirt that she wears with jeans.
Dress simple. Dressing like Bella is simple, but cute. Trendy jeans and nice fitting t-shirts is the way to go. Bella lives in Forks, Washington where it's gloomy and rainy so she wears a lot of boots, Converse shoes, jackets, and raingear. The key is to find outerwear that fits you and hugs your curves, not things that are huge and hide your nice figure.
Accessorize like Bella. Bella often accessorizes her plain t-shirt and jeans with necklaces, rings, and bracelets in the movie. Accessories are the key to looking trendy and a great way to spruce up your everyday outfit. You can find more of Bella's accessories from Twilight at a website called TwilightStyle.com.
Keep your hair down and wavy. Bella's hair has a natural wave to it that you can easily achieve by blow drying and curling with a curling iron. You can also go to sleep with your hair up in a twisted bun, and when you awake the next morning you will have naturally wavy hair.
Keep your make-up simple. Use a little foundation to hide any blemishes and light blush on your cheeks. Use lip gloss instead of lipstick on your lips to make them soft and pink. On your eyes, no need for eye shadow, just apply some mascara to make your eyelashes pop. Keep it simple. Bella doesn't need a lot of make-up to look beautiful and neither do you!