Knit fabrics is great for clothing. It comes in lightweight, medium and heavy weight.
There are two main types of knits - Jersey and Interlock.
Jersey - usually 100% cotton or cotton mix. Usually thinner or lighter-weight than Interlock knit with less stretch. It’s good for tops and fuller dresses.
Jersey Knit. If you look at a basic T-shirt, it’s probably made of jersey. With jersey, every stitch is a knit stitch, so all the loops are drawn to one side of the fabric. The front of jersey fabric is smooth, and the back has a more textured appearance since it’s composed entirely of purl stitches, which create the appearance of a bar across the fabric. Most jersey stretches in both directions: up and down as well as across. The edges of jersey have a tendency to curl, which can make sewing and hemming it rather tricky. Jersey does, however, take prints well because of its smooth surface.
Jersey is considered to be an excellent fabric for draped garments, such as dresses, and women's tops. Jersey is usually single knit. (light-weight with one flat side and one piled side)
Interlock - It usually has stretch across the grain. Great for tops, skirts and lightweight pants. It is a variation on rib knit. Instead of creating ridges of knit and purl stitches, interlock has two rows of stitches, one directly behind the other. This can create the impression that the fabric is comprised of two layers, which is why it is sometimes categorized as a double-knit fabric. (The two layers of interlock, however, can’t actually be separated.) Interlock is thicker than jersey, and both sides of the fabric are smooth, like the right side of a jersey fabric. Interlock is more stable than jersey, which means it doesn’t stretch out of shape as easily as jersey and it doesn’t curl at the edges. This ability to lie flat, as well as the fact that interlock take prints nicely, makes it popular for home sewing. Interlock is the tightest weave, gives the smoothest surface and the finest hand.