Knit fabrics are not all the same. The differences in weight, amount of stretch, and the direction of stretch will all affect how best to sew on the fabric and what kinds of projects to make from it. Miranda from One Little Minute devotes an entire post to the variations in stretch fabrics and which ones are best for which kinds of projects. The post is part of the Stretch Yourself series sponsored by Babylock and co-hosted by Miriam from Mad Mim. Go to her post to read about types of knit fabric.
[photo from One Little Minute]