Watch Cotton and Steel videos for some inspiration. You need to design your own fabric pattern.
Using Illustrator make a design –
Select all of your design and go to Object – Pattern – Make
Using the Pattern Options Box alter the width, height or the grid and overlap to get the look that you want .
When you are finished getting the look that you want click the Done word on the bar at the top left of your screen.
When you click done, it looks like nothing happen but the Swatches panel now has a new swatch with your pattern in it.
Pen tool an item and apply your pattern to that item.
It sometimes works better when you put the shape on Multiple or overlay in the layer styles.