Naturally, petite woman have a desire to look tall, it is not just about the clothes they wear, but the posture they hold.However, for women a sure way to create an illusion of being a little taller is to wear strips going down, never across. In addition, a good trick is to wear quite light clothes, for instance chiffon or cotton material, so when they walk they do not feel so weighed down, and therefore tend to walk tall with their shoulders and head held high.
A round neck I have always felt makes you look shorter and a little plump, go for a V-neck, or even try the Kaftans style tops could work wonders.
A very simple light jacket, nothing with patterns on or to much detail, a lot of detail closes a person in, you want people to see you for you, not be hit with to much detail, it would just be to chaotic for your small frame.