You're in luck! The fabric description means your pattern was designed to fit when you make the garment up in a fabric that won't S-T-R-E-T-C-H very much. You don't have to have a knit (which is usually very strechable) to be sure the garment in your size won't be so snug on your body that you can't move comfortably. Every pattern has some "ease" built into it because you have to be able to move, and the style description on the back of the pattern envelope may signal how much extra room the garment has built into its design (close-fitting/very fitted, fitted, loose, very loose, etc.) Use the style description, the picture on the pattern, the idea that you want a WOVEN fabric, and your sensibility as a buyer of dresses to find a bolt of fabric that appeals to you and get started making up your dress. :-)