1、測量下胸圍時，請赤裸上身，正常直立，用軟尺從緊貼乳房下緣的地方，圍繞身體，水平量壹圈。需要做兩個不同的測量：
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2、正常放松狀態，將軟尺稍微拉緊，但不要拉得太緊，以妳覺得剛好能固定住且舒適的松緊為宜，尺子不要勒肉。這個狀態下的測量結果壹般比較接近妳平時穿著內衣時的狀態。
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3、盡量呼氣，將軟尺拉到緊得不能更緊。這壹測量表示妳的下胸圍最小可能小到什麽程度。壹般而言內衣圍帶的平鋪長度要略小於這個長度，不然妳壹深呼吸，內衣就變寬松大背心了。
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二、上胸圍的測量
1、測量上胸圍時，同樣需要赤裸上身，用軟尺沿經乳頭的身體橫截面量壹圈。
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2、測量時不要特意呼氣或吸氣，保持正常放松狀態即可。軟尺不要特意拉緊，但是也不要特別放松，以剛好貼合皮膚為準。
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