Shirt Openness Control Test: Gradually Controlling Chest Exposure from open collar to open shirt to wide open

Key Takeaways

• Shirt openness can be controlled in stages. Exposure increases in the order: open collar → open shirt, bra visible → unbuttoned wide open.
• open white dress shirt, bra visible underneath is the best balanced “open shirt” expression. It stably reproduces a mid-stage where the shirt maintains its shape while showing the undergarment.
• Bedroom background suppresses text artifacts. In the Undressing Stage Control Test, white background + cleavage induced text contamination, but specifying a concrete space like bedroom significantly reduced this issue.
• open collar, top buttons undone produces only a minor change. About 1-2 buttons worth of opening, with the collarbone barely visible.

Experiment Design

Condition Design

In the previous Undressing Stage Control Test, the unbuttoned specification was weak on white backgrounds. This time we switched to a bedroom background and re-tested with conditions focused specifically on shirt openness.

Evaluation Criteria

• Openness degree: Width of the collar opening (V-shape depth)
• Undergarment exposure: Is the bra visible? To what extent?
• Shirt shape retention: Does it still look like “wearing a shirt” even when open?

Results by Condition

A00: Control (buttoned)

seed 1	seed 2	seed 3

Observations: In 3/3, the white dress shirt is properly buttoned. Buttons are fastened up to the collar with no chest opening. The bedroom background naturally features a bed and partitions. No text artifacts.

A01: Open Collar

seed 1	seed 2	seed 3

Observations: In 3/3, the collar is more open than the control. The V-shaped neckline deepens, showing the line from collarbone to chest. However, the change is subtle — about the level of “unbuttoning the top button.” No undergarments visible. Stays within the range of a fashion styling choice.

A02: Open Shirt (bra visible)

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seed 1	seed 2	seed 3

Observations: In 3/3, the shirt is opened wide with the bra visible. Seed 1 is particularly effective — seated on the bed with the shirt spread wide open, a lace bra clearly visible from the chest. Seed 2 also shows the bra edge peeking through a deep V-opening. The combination of open + bra visible underneath stably creates the “wearing a shirt but it’s wide open” state.

A03: Wide Open

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seed 1	seed 2	seed 3

Observations: In 3/3, the shirt is wide open. However, the no bra specification was not reflected in 3/3 — results showed either a bra worn or cleavage visible with limited opening. Seed 1 focuses on the decollete with a deep V-opening. Seed 2 has the collar spread wide in a near-braless state but covered by the shirt. wide open gives more opening than A02, but no bra remains unstable.

Comparison Summary

Practical Tips

Gradual Openness Control

1. Light styling → open collar, top buttons undone (collarbone barely visible)
2. Moderate opening → open [garment], bra visible underneath (Recommended. Best balance of stability and expressiveness)
3. Wide open → unbuttoned [garment] wide open (maximum opening, but no bra is unstable)

Text Artifact Countermeasures Confirmed

Regarding the issue from the Undressing Stage Control Test where white background + unbuttoned + cleavage induced text contamination:

• Switching to a bedroom background resulted in 0 text contamination across 4 conditions × 3 seeds = 12 images. Concrete spatial specifications likely suppress the gravure-magazine-like context
• Replacing cleavage with bra visible underneath may also have contributed

If text contamination is an issue, switching from a white background to a concrete space like bedroom is recommended.

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