Being able to smell your own body odor through your pants or clothing is typically caused by a combination of trapped moisture, bacterial activity, and the permeability of certain synthetic or tightly woven fabrics. The groin and pelvic region contain numerous apocrine and eccrine sweat glands that secrete moisture and proteins, which skin bacteria rapidly break down into volatile organic compounds. When you wear tight pants or non-breathable synthetic fabrics like polyester or nylon, sweat and heat get trapped, creating a concentrated pocket of warm air that carries volatile odor molecules upward and outward through the fabric weave.
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