As I have been demonstrating (post #14) the fabric swatch has been transformed using the transform function, Cmd/Cntrl + T or EDIT > FREE TRANSFORM. You will use the transform to make the fabric swatch and the pattern on the fabric swatch the size and scale you desire.
I briefly mention this in post #14,.......When you use a clipping mask to add the fabric to the template, you can extend the fabric beyond the template when your using the transform function. This allows you to get a better and more accurate fit!.....
If you have a large high resolution image of your fabric, you have the ability to scale the fabric swatch using transform. Your swatch should always be a large file!
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Here is the fabric swatch clipped to the template.
I have entered the transform function so you can see the transform handles.
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Here I have now SCALED the fabric swatch to the size and scale I desire for the template.
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I agree with dv8, if your fabric swatch is small, you can tile the swatch.
Here is a video that covers this matter.....
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