Bra Fit Problems: The Complete Hub
7 sizing systems25+ country calculatorsBands 28-60, cups AA-PZero data stored
Every fit problem is mechanical: a symptom, a cause, a fix. This hub lists all nine with their one-line diagnosis; each links to a full guide, and the interactive solver walks you through them question-style.
Band rides up in the back
The band is too loose to anchor, so strap tension pulls it upward.
Read the fix
Breast tissue spills over the cups
The cup volume is too small for your tissue, or the style cuts too low for your shape.
Read the fix
Cups gape or wrinkle
Cup volume or profile is too big, or the style is too tall for a shallow or teardrop shape.
Read the fix
Straps dig into shoulders
The band is doing too little work, so the straps carry the weight.
Read the fix
Underwire pokes or sits on tissue
The wire is too narrow for your root width, or the cup is too small so the wire rests on breast tissue.
Read the fix
Center gore floats off the chest
Cup volume too small, band too loose, or a close-set shape meeting a tall gore.
Read the fix
Quad or double-boob line
The cup edge cuts across tissue because the cup is too small or the style too low-cut.
Read the fix
Cup fabric wrinkles when still
Too much cup for your tissue, or a projected cup on a shallow shape.
Read the fix
One cup fits, the other does not
Most people have one side up to a half-cup larger; sizing to the smaller side squeezes the larger.
Read the fix
The pattern behind the problems
Read the causes above and one theme repeats: the band. Bands too loose cause riding, digging straps, floating gores and sagging cups; bands anchoring properly let cups and straps do their smaller jobs. Whenever two or more symptoms appear together, fix the band first and half the list usually disappears. Then verify with the 10-point fit check.
Frequently asked questions
What is the most common bra fit problem?
A band too loose, usually worn with straps too tight to compensate. It presents as riding up, digging straps and sagging cups at once, and one sister-size step down in band fixes the cluster.
Should I fix the band or the cup first?
Band first, always. A wrong band creates false cup symptoms: cups on a loose band sag and gape regardless of letter. Once the band anchors level, remaining cup symptoms are real and easy to read.
Written by the BraSizeConversion fit team. Last updated August 2026.