I just read a wonderful blog post by Kate who blogs at Seams Like a Dream and she has great information on what needle works with what fabric and why!! Best of all, she put it into a chart that you can easily copy and save for future use right here.
I'm really good at figuring out which needle to use with my longarm, because I use different weights of thread when I quilt and they demand different sizes of needles to work properly. I'm not that attentive when I am piecing...because I usually use cotton so my needle stays the same! Remember the Tummy Time quilts I made for babies? After reading Kate's blog, I understand why I was having issues when piecing the poly fabric to the cotton...it kept wanting to shift and stretch on me!! Lesson learned! I now have a copy of Kate's list of fabrics and the needles they pair with in a folder on my desktop so I can access it. When I get home, I'll print out a copy and keep it in my sewing room!