The two pictures above are both examples of Flat or Classic Roman Shades. The ideal fabrics for this style are medium weights or heavier cotton, polyester, linen, silk, faux silk, duck or canvas. Almost any fabric type will work.
Avoid light weight quilters cottons.
The two above picutres are both examples of a Banded Roman Shade. The border in the pictures is on all sides, but it can be one the two lengths and the bottom, or just the two length sides. Ideal fabrics for a banded shade are canvas and duck.
Avoid light weight quilters cottons, linen and silk for banded shades.
The two above pictures are both examples of Relaxed Roman Shades. These are not ideal for outside mounts, but are great inside mounts. The ideal fabrics for this project are medium weights or heavier cotton, polyester, linen, duck or canvas.
Avoid light weight quilters cottons and uphulstery weight fabrics
The two pictures above are examples of Hobbled Roman Shades. As these are quite a bit heavier than the other style they are ideal inside mounts and not recommended for outside mounts. The ideal fabric for this style are cotton duck, canvas and 100% pure flax linen such as Imperial Trellis.. Medium weight cottons will do, but for the best results stick to the sturdier fabrics. Upholstery weights are also a good option for this style.
Avoide light weight fabrics, especially quilter's cottons.