Key Takeaways
- tight alone has minimal effect. Specifying just
tight white t-shirt produces virtually no visible difference from a normal t-shirt (no significant change in 3/3). - Combining with large breasts produces a synergy effect.
tight white t-shirt + large breasts creates a body-hugging t-shirt that wraps around the chest with visible fabric tension (confirmed in 3/3). - Fabric tension comes from the multiplication of clothing modifier x body modifier. This confirms the hypothesis from the fabric-tension-test that “combining with body modifiers may be more effective.”
- tight specification tends to trigger text artifacts. Text tends to appear on white backgrounds with tight specification (2/3).
Experiment Design
| Parameter | Value |
|---|
| Model | z-image-turbo (6B, photorealistic distilled) |
| Steps | 8 |
| CFG | 1.0 |
| Size | 1024x1024 |
| Seeds | 3 fixed (shared across all conditions) |
| Per condition | 3 images (3 seeds) |
| Total | 4 conditions × 3 = 12 images |
Base Prompt
1girl, 32yo japanese actress, {body type + clothing specification}, standing, facing camera, upper body, simple white background, soft studio lighting
Condition List
| Condition | Body Modifier | Clothing Modifier |
|---|
| A00 | None | wearing white t-shirt |
| A01 | None | wearing tight white t-shirt |
| A02 | large breasts | wearing white t-shirt |
| A03 | large breasts | wearing tight white t-shirt |
Evaluation Criteria
- Clothing fit: Whether the fabric follows the body contour, whether tension is visible
- Chest size change: Whether chest volume has changed compared to control
- Fabric texture: Matte fabric vs. taut fabric
- Text artifacts: Whether magazine-style text appears in the image
Testing Each Condition
A00: White T-shirt Only (Control)
1girl, 32yo japanese actress, wearing white t-shirt, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: Standard body type in a white t-shirt. Matte fabric feel with a moderately loose silhouette around the body. No fabric tension visible – a natural, ordinary t-shirt rendering.
A01: Tight White T-shirt
1girl, 32yo japanese actress, wearing tight white t-shirt, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: Consistent with the fabric-tension-test results – tight alone has minimal effect. No clear change in fit compared to A00. Text artifacts (logos/text) appeared in 2/3, with the white background + t-shirt combination being interpreted as a graphic tee.
A02: large breasts + White T-shirt
1girl, 32yo japanese actress, large breasts, wearing white t-shirt, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: large breasts slightly increases chest size. Compared to A00, the chest area of the t-shirt shows more volume (confirmed in 3/3). However, fabric tension is not prominent – the t-shirt has enough looseness that the body type change doesn’t translate well to the fabric.
A03: large breasts + Tight White T-shirt (Combination)
1girl, 32yo japanese actress, large breasts, wearing tight white t-shirt, standing, facing camera, upper body, simple white background, soft studio lighting
Observations: The tight + large breasts combination produces the most effective results. In 3/3, the body-hugging t-shirt wraps around the large chest, with visible fabric tension especially around the chest area. The fit that was absent in A01 (tight alone) is present in A03, showing that body modifiers unlock tight’s effect. Compared to A02 (large alone), the fabric conforms more closely to the body.
Note: tight alone has almost no effect, but combined with large breasts the fabric tension appears immediately. It’s notable that neither element works alone, but the combination produces a clear effect.
Comparison Summary
| Condition | Chest Size | Fabric Fit | Tension | Text Artifacts |
|---|
| A00: White t-shirt only | Standard | Loose | None | 0/3 |
| A01: tight | Standard | Minimal change | None | 2/3 |
| A02: large breasts | Slightly larger | Loose | Weak | 0/3 |
| A03: large + tight | Larger | Body-hugging | Present (3/3) | 1/3 |
Practical Tips
- For fabric tension, don’t use tight alone – pair it with a body modifier.
tight + large breasts is the most effective combination. - tight alone is mostly a wasted token. Without body type specification, tight’s visual effect is nearly zero.
- Body modifiers (like large breasts) serve as prerequisites for clothing modifiers. tight only activates when there’s a larger body for the fabric to stretch against.
- If text artifacts are a concern, consider alternatives to white t-shirts (colored top, tank top, etc.).
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