Everybody has that one friend that is very stylish. Anything the friend wears gives her that fresh American style outlook.
Buy simple, yet classic dresses that go with any event to retain that fresh American style outlook.
You may buy clothes that fit you, but they might not complement your body. To avoid this situation, buy clothes you feel comfortable in.
Humans are prone to impulse buying. You should not buy clothes that you don't need because they are on sale. You might not wear them and waste your money.