A training-bra size chart is useful only when you know whose chart it is. Size labels are not a universal measurement standard, so TrainingBras.com does not publish a fake “one chart fits every brand” conversion.
Rule #1
Use a size chart from the manufacturer of the exact product whenever possible, and check that it is current. Then verify the bra in real movement.
What a useful size chart should show
Depending on the sizing system, look for body-measurement ranges such as underbust, bust/chest, band/cup, or apparel-size equivalents. A chart that lists only age ranges gives less fit information than one tied to actual measurements.
How to read a chart
- Confirm whether measurements are in inches or centimetres.
- Confirm whether the chart lists body measurements or actual garment measurements.
- Find the row containing the wearer's current measurement.
- Check all required measurements; do not select based on only one field if the chart requires two.
- Read any brand note about stretch or between-size choices.
Comparing two brands
Compare the underlying measurement ranges, not the letters. If Brand A calls a range “Small” and Brand B calls a similar range “Medium,” those labels are different names for overlapping body measurements — not evidence that one brand “runs wrong.”
| Compare | Good basis | Weak basis |
|---|---|---|
| Brand A vs Brand B | Published body-measurement ranges | S vs S |
| New purchase vs old bra | Current measurements + current chart | Old label alone |
| Youth size vs alpha size | Underlying measurements | Age or grade |
The TrainingBras.com brand-size database
Our future brand database will preserve the manufacturer's published ranges, source URL and last-verified date. That will let us compare brands transparently without pretending we created their sizing standards.
After choosing from a chart
A chart chooses a starting size. The final decision comes from the 5-Point Fit Check: band, straps, front, movement and comfort.
Body measurements vs garment measurements
This distinction matters. A body-measurement chart tells you which body range the manufacturer designed a size to fit. A garment-measurement chart tells you the physical dimensions of the bra itself. Stretch garments are normally smaller than the body they are designed to fit, so the two numbers should not be compared as if they mean the same thing.
Check whether the chart is current
Manufacturers can change product patterns, naming systems or chart ranges. When a size decision matters, use the chart linked from the current product page rather than an old screenshot or an unsourced chart reposted elsewhere.
Use return and exchange policies as part of sizing
When buying a first bra online, the practical ability to exchange a size can be more valuable than chasing perfect certainty from a chart. Check hygiene restrictions and return conditions before removing tags or washing the item.