Талия девушки была тонкая и гибкая. | The girl's waist was thin and lithe. |
Красивый пояс перехватывал её талию. | A pretty belt encircled her waist. |
NB When the word талия functions as a subject and does not have a descriptive modifier, the construction талия у + Genitive is often preferred to (a) and (b), above: | |
Талия у девушки была тонкая и гибкая. | The girl's waist was thin and lithe. |