Cosabella Bra Size Guide & ConverterLuxury fabrics, couture-inspired lace, and refined everyday silhouettes.
Use our conversion tips to shift into Cosabella's artisanal lace and luxury basics with clarity on cup depth, wire shape, and fabric feel.
Cosabella size snapshot
Sizing system
US band/cup sizing with even-numbered bands and double-letter cups (DD, DDD/F, G).
Band range
XS–XL (30–40 equivalents)
Cup range
A–G in wireless lace
Best for
Cosabella appeals to lingerie collectors who care about couture lace, delicate details, and refined finishes.
- Cosabella bands lean stretchy; plan for faster relaxation and consider adding the sister size down for backup.
- Cosabella cups are shallower; fuller-on-top shapes may need to size up or choose more open necklines.
- Cosabella features lace-forward construction with supportive seaming hidden under delicate overlays.
Convert your size into Cosabella
Pick the brand and size you already wear. We pre-selected Cosabella on the right so you can see the equivalent in one click.
Convert to Cosabella
Size Guide
Enter your current bra size and select the brands you want to convert between. The converter will help you find your equivalent size in different brands.
Tips for Best Results:
- Enter your size exactly as it appears on your current bra
- Make sure to select both the source and target brands
- Different brands may have slightly different sizing standards
- Always try on bras when possible for the best fit
Fit callouts worth noting
Bands relax quickly with wear
Cosabella often uses soft elastics that ease up after a few wears, especially in wireless or lounge styles.
Try this:
Order your regular band and the sister size down so you can choose the secure feel you prefer.
Cups lean shallow or push-up heavy
Padding placement and low gores at Cosabella can crowd fuller-on-top tissue, causing spill at the edge.
Try this:
Sister size up in the cup or choose balconette/demi styles with taller upper cups to trim spillover.
Lace overlays hide structured seaming
Even delicate Cosabella lace bras rely on seamed linings that change stretch and coverage.
Try this:
Read fabric composition and test the style seated and standing to confirm seams sit flat.
Try-on strategy playbook
Dial in your baseline size
- Run the ABTF calculator or your trusted measurement routine first so the converter starts from fresh numbers.
- Keep your most reliable bra size handy; the converter maps it directly into Cosabella sizing.
- Note the style you are targeting (plunge, balconette, wireless) so you can sanity-check the fit advice below.
Plan for stretch-friendly bands
- Order your usual band alongside the sister size down to see which feels secure after break-in.
- If you prefer lounge-level comfort, keep the stretchier option for home wear and reserve the firmer one for outings.
- Use easy return windows to compare band tension across at least two sizes before committing.
Audit fabric stretch before committing
- Inspect inner mesh or lining; supportive layers should match your support expectations.
- Try the bra seated, standing, and reaching to confirm seams stay flat.
- Hand wash or use lingerie bags so lace retains its resilience.
Keep exploring
How to Measure Your Bra Size at Home
Step-by-step measuring tips before you add new pieces to your drawer.
Read moreFit Check Wizard
Troubleshoot gaping, spillover, or band riding in minutes with guided diagnostics.
Read moreSister Size Explorer
See every sister size combination when you need extra breathing room or cup depth.
Read moreKeyword prompts people use
Use or monitor these search phrases when you are researching Cosabella sizing. They surface comparison guides, calculators, and real shopper feedback.
Refresh your measurements
Accurate numbers keep your converter results honest. Grab a soft tape and follow the pro guide below before you submit that cart.
Professional Bra Measurement Guide
Essential Tools for Accurate Measurement
Required Equipment
- Soft measuring tape (preferably in inches)
- Non-padded bra or no bra
- Full-length mirror
- Notepad for recording measurements
Measurement Preparation
- Stand straight with shoulders relaxed
- Wear a non-padded bra or no bra
- Ensure the measuring tape is parallel to the floor
- Take measurements in a well-lit room
Step-by-Step Measurement Guide
Band Size Measurement
- Measure under your bust, where the bra band sits
- Keep the tape snug but not tight
- Ensure the tape is parallel to the floor
- Round to the nearest even number
Bust Size Measurement
- Measure around the fullest part of your bust
- Keep the tape parallel to the floor
- Don't pull the tape too tight
- Record the measurement in inches
Cup Size Calculation
- Subtract band size from bust measurement
- Use the difference to determine cup size
- Each inch difference represents one cup size
- Example: 1" = A, 2" = B, 3" = C, etc.
Professional Tips for Accurate Results
Common Measurement Mistakes
- Measuring over a padded bra
- Pulling the tape too tight
- Not keeping the tape parallel to the floor
- Measuring at the wrong position
Professional Recommendations
- Take measurements at least twice for accuracy
- Measure at the same time each day
- Consider professional fitting for best results
- Update measurements every 6 months
Frequently asked questions
Does Cosabella run true to size?
They skew relaxed. Cosabella bands soften quickly, so keep the sister size down handy if you prefer extra hold.
What if I am between band sizes at Cosabella?
Include the smaller band so you have a backup once the elastic relaxes after a few wears.
Which Cosabella styles work best for luxury lingerie fans?
For luxury lingerie fans, choose Cosabella's seamed lace bras with supportive linings; they mould comfortably while showcasing couture detail.
Can I convert from other sizing systems into Cosabella?
Yes. Cosabella follows US sizing, so convert from UK or EU using our tool and remember double letters translate differently across systems.