If you are shopping for a wedding dress, or a big event, always go to the store with makeup on, and hair done. This way, you will get a better sense of how the dress will look on you.
Give away old clothes and stuffs you don't wear anymore. You will have more space in your closet and you will be able to see every item easily And choose wisely!
Best accessory you can add to your daily casual look, is a nice colorful SCARF, specially in the summer. It gives you a fresh and stylish look.. but don't forget to keep it simple !