Brioche knitting is a family of knitting patterns involving tucked stitches, i.e., yarn overs that are knitted together with a slipped stitch from the previous row. Such stitches may also be made by knitting into the row below (equivalent to the slipped stitch) and dropping the stitch above (equivalent to the yarn over).
The tucked stitches may form a second layer of knitting in front of the first layer, resembling an array of arches or (seen upside-down) of fish scales.
Although warm and beautiful in texture, garments made from brioche knitting have the drawback that the tucked stitches are liable to get caught and be pulled out.
Brioche knitting may have originated in the Middle East. However, the term "brioche" seems to have derived from French slang for "mistake". The name might be a reference to the brioche dinner roll, which is formed of two pieces, one stacked atop the other.