Guides

Fit & Size Guides

Answers organized by the problem you're trying to solve, not by publish date.

Size Basics
How Can Sister Sizes Hold the Same Cup Volume?
Sister sizes change the band and cup letter in opposite directions to keep a similar cup-volume family. See how the relationship works.
Size Basics
How Do Bra Cup Sizes Work?
Cup letters describe a difference relative to the band, not one fixed breast volume. Learn cup progression, sister sizes and country differences.
Size Basics
How to Measure Bra Size Without a Measuring Tape
A string or non-stretch ribbon can provide a rough measurement when checked against a ruler. Learn the limits and safer alternatives.
Size Basics
Is a Bra Size Calculator Exact or Only a Starting Point?
Bra calculators estimate a useful starting size, but brand, shape and construction determine the final fit. Learn what a result can and cannot tell you.
Size Basics
Why Does a 34D Look Smaller Than a 38D?
The same cup letter becomes a different volume on a different band. Learn why 34D and 38D do not represent the same breast size.
Size Basics
Why Does My Bra Size Calculator Result Look Too Big?
A larger cup letter can be correct when the band is smaller. Learn why bra calculator results look surprising and how to check what to try next.
Fit Problems
Can Bra Cups Gape Because They Are Too Small?
Gaping does not always mean a cup is too large. Learn how small, shallow or mismatched cups can create space and how to find the real cause.
Fit Problems
How to Scoop and Swoop for a More Accurate Bra Fit
Learn the scoop-and-swoop method, why it changes cup fit and what spillage, gaping or wire pressure afterwards can reveal.
Fit Problems
Is Your Bra the Wrong Size or Simply Worn Out?
Learn how stretched elastic, distorted cups, damaged wires and worn adjusters can imitate a bra-size problem.
Fit Problems
Is Your Bra Too Small or Just the Wrong Shape?
Learn how to separate a bra that lacks cup volume from a shape mismatch using the band test, wire position, cup depth and movement clues.
Fit Problems
Should I Change the Cup Size or the Band Size First?
Use the band-only test and cup fit signs to decide whether to change the band, cup or both - and when a sister size is the right move.
Fit Problems
The Upside-Down and Backwards Bra Test
Use the band-only bra test to find out whether the band is genuinely too tight or whether small or shallow cups are creating the pressure.
Fit Problems
Why Does My Bra Band Feel Tight When the Cups Are Too Small?
Small or shallow cups can borrow space from the band and make the whole bra feel tighter. Learn the band-only test and what to try next.
Fit Problems
Why Does My Bra Fit in the Morning but Feel Wrong Later?
Heat, movement, body fluctuations and a shifting bra can change how the fit feels during the day. Learn what is normal and what to test.
Fit Problems
Why Does My T-Shirt Bra Gape Even in the Right Size?
T-shirt bra cups can gape because of their rigid moulded shape, cup height or lack of depth - not only because the cup is too large.
Breast Shape
Can Breast Shape Change the Bra Size I Need?
Breast shape does not rewrite your measurements, but it can change which nearby size and cup construction fits best. Learn how and why.
Breast Shape
How to Choose a Bra for Your Breast Shape
Match projection, fullness, root width and spacing with cup construction - not rigid body labels - to choose a better first bra style.
Breast Shape
How to Fit a Bra When One Breast Is Larger
Fit the larger breast first, then adjust the smaller side with strap changes, flexible cups or a removable insert without compressing the larger side.
Breast Shape
Projected vs Shallow Breasts: Why Bra Shape Matters
Understand projection, shallow shapes and cup depth - and why two people wearing the same bra size may need very different cup constructions.
Shopping
How to Buy a Bra Online Without Guessing the Size
Use measurements, sizing systems, model construction, reviews and return terms to choose a smarter online bra-size test.
Shopping
What If Your Calculated Bra Size Is Not Sold in Stores?
Verify the sizing system, check nearby sister sizes and avoid forcing yourself into a retailer’s narrow size range when your result is unavailable.
Size Changes
How Often Should You Measure Your Bra Size?
Measure at least yearly when your fit is stable, and sooner after body changes or repeated fit problems. Use these signs to know when it is time.
Size Changes
Why Does Bra Size Change Over Time?
Bra size can change with weight, hormones, pregnancy, ageing, training, surgery and garment wear. Learn what to track and when to remeasure.
Brand Sizing
How to Compare Bra Sizing Between Brands
Compare the actual system, model, band, cup shape and material - not only two brand charts - to predict a more useful starting size.
Brand Sizing
Why Do I Wear Different Bra Sizes in Different Brands?
Bra sizes vary because brands use different patterns, fit models, fabrics and country systems. Learn how to compare labels without blaming your body.