Welcome to the Quilting Board!

You know that feeling when you've finished all your quilting projects and your studio is perfectly clean???? Me neither.
It's not how fast you sew, it's how well you sew fast! Wait, I think that's supposed to be MOW!
If you donate quilts, polyester double knit would be great for the homeless--very warm, stands up to hard use, easily washable and dryable.
Courtesy is not optional.
http://theeclecticabuela.blogspot.com/
I make quilts for homeless families, and these poly double knit fabrics are excellent.
I suggest you use a serger. The quilt will hold. If you have no serger, then I suggest zig zagging over the seams (and using 1/2 inch seams).
One thing I learned the hard way: make sure the weight of the fabric in the quilt is consistent. I used a lighter weight poly double knit in one quilt for the color, and I've been repairing it for years. However, a stretch stitch, as suggested above, would help also.
cricket_iscute - how big a blanket do you make for the homeless adults? I've inherited huge amounts of polyester double knit and polyester/wool blends. I've brought them home thinking that I will make blankets for the homeless, one piece of double knit on one side and polyester/wool blends for the other side. Been washing loads of poly/wool as they do shrink....
I made a quilt out of polyester double knits for a grandson when he graduated and told him he could take it anywhere, to the beach, to ball games, put it in his car, take it camping, where ever he wanted. He liked it in his room because it was so warm all he needed was a sheet and the quilt, easy bed making!
Made a couple quilts with the double knit, and lots of clothing, never found stretching while sewing to be a problem.
Great for dog beds.
Debbie
Machine It
I know from someone who use to work with it for utility quilts that she would place a piece of plain white paper (like for making copies) on the back side and some odd reason it wouldn't stretch. She would remove the paper or not depending on her mood. She was from the Mennonite community and loved re-cycling fabrics that others hated or didn't want. You might want to give it a try on a small but simple one-square pattern lap quilt as a tester. If you don't like it you could donate it to charity or find an older quilter who has worked with it in the past. Just some food for thought.
Tricia
http://tricia-ramblingsofaquilter.blogspot.com/
Currently working on a "Flat Curtis" Quilt with boy child.
Use two pieces of fabric; one for the front and one for the backing. Tie and bind. Done.