Warp knitting is a family of knitting methods in which the yarn zigzags vertically, i.e., following adjacent columns ("wales") of knitting, rather than a single row. For comparison, normal knitting is called weft knitting.

Since warp knitting requires that the number of separate yarns equals the number of stitches in a row, warp knitting is almost always done by machine, not by hand.

Warp knitting comprises several types of knitted fabrics, including tricot, raschel knits, and milanese knits. All warp-knit fabrics are resistant to runs and relatively easy to sew. Tricot is very common in lingerie. Milanese is stronger, more stable, smoother and more expensive than tricot and, hence, is used in better lingerie. Raschel knits do not stretch significantly and are often made bulky; consequently, they are often used as an unlined material for coats, jackets, straight skirts and dresses. Womens knickers, known in American English as panties Lingerie is a term, derived from the French language, for womens undergarments. ...

Reference

Shaeffer, C. (1994) Claire Shaeffer's Fabric Sewing Guide, updated ed., Chilton Book Co. ISBN 0-8019-7802-5