When the outer side of the chest is visible through a gap in the clothing, or if only the side of the chest is visible from the side or from behind.

Do not confuse with pectoral cleavage.

Examples

• Danbooru post #8072027
• Danbooru post #6728910

See also

• presenting sidepec
• bare pectorals
• pectoral cleavage
• sideboob

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