Step 1: Analyzing Garment Wrinkle Mechanics:
Wrinkles in a worn garment are diagnostic indicators of fit issues. They point directly to the source of tension or excess fabric:
- Tension/Stress Wrinkles: Tight, straight, horizontal, or diagonal pulling folds point toward the area of restriction.
- Sagging/Drape Wrinkles: Loose, soft, vertical folds indicate excess fabric.
Step 2: Evaluating the Symptoms:
The question describes sleeves that pull across the upper arm (bicep area) and cause wrinkles.
- When the bicep girth of the sleeve is drafted too narrow relative to the physical circumference of the wearer's upper arm, the fabric is stretched to its maximum limits under horizontal stress.
- This lateral stress pulls the fabric grainline off-balance, creating tight, horizontal strain lines across the upper arm.
Step 3: Comparing Other Fit Flaws:
If the sleeve were loose (B), it would drape smoothly. If the shoulders were too narrow (C), the stress wrinkles would pull across the upper back and chest, rather than originating on the upper arm itself.