Why Doesn't My Bra Center Gore Sit Flat Against My Sternum?
In an underwired bra, the central fabric and wire bridge between the cups (the center gore) should sit completely flush—a state bra fitters call "tacking"—against your sternum bone. A floating gore indicates severe cup overloading or band instability.
1. The Biomechanics of Sternum Tacking
Underwire bras act as a suspension bridge. The underwires enclose each breast mound separately, transferring bust weight to the underbust band anchored around your ribcage.
When your cup volume matches your breast tissue, the underwire tips press comfortably flat against your sternum bone between your breasts. If the cups are too small, your breast tissue cannot sink into the cups and acts like a hydraulic wedge, forcing the center gore 0.5 to 2 inches away from your chest wall.
2. Three Primary Reasons Why Gores Float
| Root Cause | Anatomical Symptom | Corrective Fix |
|---|---|---|
| Insufficient Cup Volume | Gore floats 1+ inches off chest; breasts press together in middle. | Increase cup letter by 1-2 steps (e.g. 34C → 34D or 34DD). |
| Close-Set Breast Anatomy | Breasts touch in center with < 1 finger space between roots. | Switch from high balconette gores to low-wire plunge styles. |
| Pectus Carinatum / Excavatum | Sternum bone protrudes or dips abnormally. | Use flexible plunge wires or soft-foam wireless cups. |
3. Plunge vs. Balconette Gore Height Guide
Gore height varies significantly across bra cuts:
Balconette & Full Coverage Gores
Tall center bridges (2.5 to 3.5 inches tall). Ideal for wide-set or projected breast tissue where maximum separation and lift are required.
Plunge Cut Low Gores
Short center bridges (0.5 to 1.5 inches tall). Essential for close-set breast roots where tall underwire channels dig into breast tissue.
4. Re-Calculate Your Baseline Cup Size
Frequently Asked Questions
Should a bra center gore touch your sternum bone?↓
Yes, in an underwired bra, the central fabric bridge (center gore) should sit completely flat ('tack') against your sternum. If it floats away from your chest wall, your cups are too small or the band is too loose.
Is it normal for a wireless bra gore to float?↓
Yes. Wireless bras and bralettes lack rigid steel underwires, so their center bridges naturally rest over breast tissue without tacking flush against the sternum. Tacking is a structural requirement only for underwired bras.