如何判断内衣是否合身

✅ 合身：扣在最外排扣上，底围水平环绕身体，不勒不滑。两根手指能轻松滑入底围下方。

✅ Good fit: Fastened on loosest hooks, band sits level, not riding up or digging in. Two fingers fit comfortably under the band.

❌ 不合身：底围上跑（太松）→ 换小底围或扣更紧。底围勒出深痕（太紧）→ 换大底围或使用延长扣。超过两根手指的宽度 → 太松。

❌ Poor fit: Band rides up (too loose) → go down a band size or tighten. Deep red marks (too tight) → go up a band size or use an extender. More than two fingers fit → too loose.

✅ 合身：乳房组织被完全包裹，无溢出（上方、侧面、下方）。罩杯面料平整无褶皱。乳头在罩杯接缝或最深处。

✅ Good fit: Breast tissue fully contained, no spillage (top, sides, bottom). Cup fabric smooth, no wrinkles. Nipple sits at the seam or deepest point of the cup.

❌ 不合身：乳房溢出或出现"副乳"效果 → 罩杯太小。罩杯空杯、有褶皱 → 罩杯太大或杯型不匹配。

❌ Poor fit: Spillage or "quad-boob" → cup too small. Wrinkles/gapping in cup → cup too large or shape mismatch.

✅ 合身：钢圈贴合在胸底线（乳房与胸壁的自然折痕处）。钢圈末端（腋下侧）指向腋窝中间，不戳肋骨。

✅ Good fit: Wire follows the inframammary fold (natural crease). Wire ends point toward mid-armpit, not digging into ribs.

❌ 不合身：钢圈压在乳房上 → 罩杯太小。钢圈离开胸底 → 底围太大或杯型不匹配。钢圈戳腋下 → 钢圈太宽或款式不合适。

❌ Poor fit: Wire sits on breast tissue → cup too small. Wire lifts away from chest → band too large or wrong shape. Wire pokes armpit → wire too wide or wrong style.

✅ 合身：肩带贴合肩膀，不会滑落，也不会勒出深痕。调整到合适长度后，肩带提供约10-20%的支撑。

✅ Good fit: Straps stay on shoulders without slipping or digging in. After adjustment, straps provide ~10-20% of support.

❌ 不合身：肩带频繁滑落 → 肩带太松或款式不合适（可尝试防滑肩带或交叉背款式）。肩带勒出深沟 → 底围太松，肩带过度补偿。

❌ Poor fit: Straps constantly fall off → too loose or wrong style (try silicone grips or racerback). Deep grooves from straps → band too loose, straps overcompensating.

✅ 合身：鸡心位（两罩杯之间的部分）平贴在胸骨上，没有浮起或倾斜。

✅ Good fit: The center gore (between the cups) lies flat against your sternum, no floating or tilting.

❌ 不合身：鸡心位浮起 → 罩杯太小或底围太大。先扣紧底围，如果不改善则换大罩杯。大胸（D+）可考虑低鸡心款式。

❌ Poor fit: Gore floats/tilts → cups too small or band too large. Tighten band first; if still floating, go up a cup. For larger busts (D+), low-gore styles may fit better.