I have almost no experience in this, but needed a thicker thread to put a blanket stitch edging on some fans. I found what is sold as "jeans" weight. The label has fallen off, sorry, but it was from a quilt shop. It appears to be about a 30 weight. It worked out well. I used a 40 weight in the bobbin.
Edited to say it was "YLI Jeans stitch thread size 30".
Last edited by Garden Gnome; 02-05-2018 at 08:09 AM.