Bottom-Up Knitting
Bottom-up knitting is the traditional construction method where a sweater is knitted from the ribbing upward toward the shoulders, often in separate pieces.
Explanation
Bottom-up is the classic way to knit sweaters: you start with ribbing at the bottom of the body and sleeves, knit upward, and finally shape the neckline and shoulders. The method is often worked in separate pieces - front, back, and sleeves - knitted individually and sewn together at the end (finishing/seaming), but can also be knitted seamlessly in the round up to the underarms. The advantage is full control over length from the bottom up, while relying more on gauge and calculation for the pieces to fit together.