I have every confidence my Impetus fabric from BWDD is downproof, however my needle holes are not. What size needle and thread do people typically use for 850+ down applications? Does thread tension need to be dialed down to keep from pulling on the holes as they are stitched? I heard longer stitch length is better since fewer holes are made; I'm guessing down can't escape between stitches so long as seams are rolled/felled properly?
Thanks for the advice,