I'm so glad you asked, bc I have been strictly, an all-cotton-girl, for fear of quilts not lasting.
Had read so often, that different weights of fabrics in a quilt, would cause it to eventually tear or wear, at seams.
I know they can't last forever, but had a 'thing' about getting it right.
I do 100% cotton threads on all quilts too, bc they say, the others, will 'cut' your cotton material, over time.
So, basically I use poly-cottons, in grandbabies clothes. Can't find that many in my LQS...thanks for jogging my pea, about looking on here.
Clothes look a bit crisper, and wear a bit longer on kids, if not all cotton.
Good post! thanks! :D