AI Skill Report Card
Drafting Sewing Patterns & Technical Flats
Quick Start13 / 15
Given a garment description (e.g., "a fitted long-sleeve button-down shirt"), produce:
- A list of required pattern pieces (front bodice, back bodice, sleeve, collar, collar stand, cuff, plackets, pockets)
- Base measurements from a size chart (bust, waist, hip, shoulder, sleeve length, neck)
- A flat-lay technical drawing description: front view, back view, seam lines, stitch lines (dashed), notches, grainlines, and fold lines
Example output for one piece:
FRONT BODICE PANEL
- Grainline: vertical, parallel to CF (center front)
- Seam allowance: 1cm (SA) marked with dashed line 1cm inside cut line
- Notches: shoulder point, armhole (single), waist (double), CF fold
- Darts: bust dart from side seam to bust point, waist dart
Recommendation▾
Add a third example showing a 'bad' output (e.g., missing SA or notches) contrasted with the corrected version to reinforce pitfalls.
Workflow14 / 15
Progress:
- Step 1: Clarify garment type, silhouette, and target size/measurement chart
- Step 2: Break the garment into its constituent pattern pieces
- Step 3: Assign base measurements and ease allowances per piece
- Step 4: Draft the block/sloper (basic shape before style lines)
- Step 5: Add style lines, darts, seams, and closures onto the block
- Step 6: Add construction markings (grainline, notches, fold lines, SA)
- Step 7: Produce flat-lay technical drawing (front + back, sometimes side/detail callouts)
- Step 8: Grade across sizes if needed (scale increments per size chart)
- Step 9: Output as labeled list/spec sheet or vector-ready outline description
Step 2 checklist — standard piece breakdown by garment type:
- Top/shirt: front, back, sleeve, collar, collar stand, cuff, plackets, yoke
- Pants: front leg, back leg, waistband, fly shield, pockets
- Dress: bodice front/back, skirt front/back, sleeve, facings
- Jacket: front, back, side panel, sleeve (two-piece), collar, lapel, lining pieces
Recommendation▾
Include a concrete grading example (e.g., how bust measurement increments differ from shoulder across sizes S/M/L) since grading is mentioned but not demonstrated.
Examples15 / 20
Example 1: Input: "A-line skirt, knee length, side zip, no darts" Output:
PIECES: Skirt Front (cut 1 on fold), Skirt Back (cut 2), Waistband (cut 1 on fold)
Skirt Front: CF straight grainline, A-line flare from hip to hem, no waist dart (ease distributed in flare), waist seam notch at side, hem allowance 4cm marked as dashed fold line
Skirt Back: identical flare, side seam zip opening marked 18cm from waist with notch, CB seam straight
Waistband: straight rectangle, interfaced, grainline parallel to fold, notches matching front/back side seams
Example 2: Input: "Technical flat for a cropped bomber jacket, front view only" Output:
Front view flat lay:
- Zip center front, drawn as double parallel lines with zipper pull symbol at top
- Ribbed hem and cuffs shown as horizontal parallel hatch lines
- Two welt pockets at hip level, drawn as short horizontal rectangles with topstitch (dashed) outline
- Raglan sleeve seam from underarm to neckline, solid line
- Topstitching 0.5cm from all finished edges, shown as dashed lines
Recommendation▾
Provide a minimal size chart table (bust/waist/hip by size) so measurement assignment in Step 3 has real reference data rather than relying on unspecified external chart.
Best Practices
- Always separate cut lines (solid) from stitch/topstitch lines (dashed) and fold lines (dash-dot) in any technical drawing description.
- State seam allowance explicitly per piece; unlisted SA defaults to 1cm (garment) or 0.6cm (knits/lightweight).
- Mark grainline on every piece — it's the single most important construction cue.
- For flats (technical drawings, not patterns), draw garment as if worn on an invisible body — symmetrical, flat, no wrinkles, both front and back views included.
- When referencing "cut on fold," specify which edge (CF or CB) sits on the fabric fold.
- Keep pattern piece names standardized (front, back, sleeve, facing, lining) so pieces map cleanly to a cutting layout.
Common Pitfalls
- Don't confuse a flat sketch (stylized garment illustration for spec packs) with an actual sewing pattern (precise geometric pieces with SA and grainlines) — clarify which is being requested.
- Don't omit notches — without them, pieces can't be matched correctly during construction.
- Don't forget ease allowance separate from body measurements; a pattern drafted to exact body measurements will not fit.
- Don't grade pattern pieces by uniformly scaling the whole image — grading increments differ by body landmark (bust grows faster than shoulder width, etc.).
- Don't skip specifying fabric behavior (woven vs. knit) — it changes SA, ease, and whether darts vs. stretch are used to shape the garment.