Yesterday I gave the demo on using Pearl Cotton size 8 for Big Stitch hand quilting. The quilts I had to show, were with using size 8. And some quilts will look awesome with that size Pearl Cotton.
If you are going to use size 12 Pearl Cotton, you will want to adjust your needle size. I would suggest a large eye needle of your choice. I have not used the size 12 on a quilt yet and will have to see what needle works best for me.
Please experiment and find your comfort zone.
Thank you so much for your interest in Big Stitch. I hope you enjoy it as much as I do.