If you are not sure if it is the pattern or the fabric, I'd suggest to lay out the pieces of fabric and leave them out for a while. As you walk by the stash check your feelings when you see the fabrics. Look at them in different lights. See if one of them jumps out at you (in a good or a bad way). That is how I audition my stash.
If you decide that you like the fabric, then see if you can tie the fabrics to the pattern and lay them out in a way to compare to the sizes in the pattern - then repeat the exercise.