purlJam

<planning>
1. **Design Strategy**: 
- Style: 겨울 코위찬 가디건 — a beginner-friendly, boxy, drop-shoulder worsted-weight cardigan with 2x2 rib hem and button bands. 
- Techniques: flatbed knitting on a standard-gauge domestic machine (4.5 mm / “standard” Brother-style bed spacing) using main bed stocking stitch and the ribber for hems/bands. No complicated set-in sleeve caps — sleeves are simple rectangular tubes (drop shoulder) to keep construction and finishing easy for a beginner.
- Ease: moderate positive ease for layering (garment chest ≈ 110 cm on a finished body circumference).

2. **Construction Plan**:
- Bottom-up, three-piece body (Back, Left Front, Right Front) plus two sleeves, all knitted flat on the main bed. 
- Hem and button/neck bands worked in 2x2 rib on the ribber (double bed). After rib hem finished, switch to main bed stocking stitch for the body. 
- Sleeves are straight tubes (no increases/decreases), attached to side seams to create a drop-shoulder look.
- Finishing: seam shoulders and sides, rehang rib hems if needed for a firm edge, pick up and knit or attach button band as knitted rib band, bind off with latch tool or rehang + bind off method.

3. **Quality Assurance**:
- Keep all pieces within typical domestic machine needle count limits (≤ 200 needles in use at once). Pieces are sized so each piece fits on the needlebed individually.
- Avoid complex shaping: reduced risk of mismatched armholes/shoulder seams. Provide explicit RC (row counter) checkpoints, carriage directions, tension settings, and exact needle actions.
- Call out potential pitfalls: tension changes between ribber and main bed, needle counts rounding, maintaining even selvedges for seaming, accurate RC counting for neck and band placement.

4. **Final Calculations**:
- Working gauge (standard worsted on 4.5 mm machine): 27.5 stitches = 10 cm (2.75 sts/cm), 36 rows = 10 cm (3.6 rows/cm).
- Target finished circumference: 110 cm (includes ease). Body pieces:
  - Back width = 55.0 cm