Twill is fabric that has a diagonal pattern. It is actually woven in such a way as to create diagonal "ribs" in the fabric itself (not just colored diagonal lines). Think of cordoroy - that is a fabric with a vertical (up and down) pattern woven into it. Twill is diagonal weaving. If a twill fabric has extra "give" so that it can expand (stretch), it is a stretch twill.
Stretch twill often refers to the fabric having a small percentage of lycra/spandex in it, usually 2-4%.
Stretch twill is a type of fabric that is woven in a diagonal pattern. Some products that are made from it include shorts, pants, dresses, jackets, and slipcovers.
twill is a very rough fabric that comes from elephants.
A twill jersey is a type of sports uniform that is made of twill. Twill is a woven fabric with a ribbed pattern that is diagonal and parallel.
A ribbed fabric is a fabric with intervening raised lines or ribs. Ribbed fabrics may come in a variety of compositions including cotton, wool and silk.
A zanella is an Italian wool or twill fabric.
Twill fabric can be soft and airy or thick and warm, depending on the thread count and the method of weaving.
fabric strength and durability
The easiest way to identify a twill weave is if the fabric appears to have a diagonal "texture"- this is caused by the offset of weft and warp threads when the fabric is woven (for example, over once, under twice. As opposed to over once, under once as a normal weave). The grain of the fabric is not actually diagonal, but the twill weave gives it that appearance.
Cotton
For medical uniforms, T/C fabric as twill is good. but the best fabric is CVC, more cotton, but not 100% cotton.
prunella
A "knit" fabric will stretch, either side to side and/or up to down, but a "woven" fabric will not stretch.
Denim is fabricated from cotton twill yarn.