Here's what we know about how Yellowberry sizes its bras, based on what the brand itself publishes. We keep their numbers separate from our own opinions, so if anything changes later, it's easy to see where each fact came from.
Database snapshot
Brand role: Training-bra / tween specialist
Sizing model: Alpha sizing across its training-bra range, with product charts using underbust and overbust measurements.
Published range/context: Published guidance describes seven training-bra sizes; XS begins around 24–26 in underbust and 25–29 in overbust, with larger sizes extending upward.
Last verified: August 21, 2026
Sizing system
Yellowberry advises using each product page’s size guide and notes that clothing size alone may not predict bra fit. The company also advises sizing up when between sizes for some training-bra styles.
When you're actually buying, use that specific product's own chart if one's given. A brand-wide chart is a decent starting point, but the exact construction of a specific bra can still change how it feels.
Construction and style attributes recorded
These are category-level attributes observed in the brand's current catalog or published guidance. They are not claims that every product from the brand has every listed feature.
How TrainingBras.com will use this record
- Identify the brand's sizing vocabulary before comparisons are made.
- Map measurement ranges only when the manufacturer publishes them.
- Record style-level exceptions separately instead of overwriting the brand default.
- Connect product attributes to our Types, Construction and Materials pages.
- Require a current manufacturer source and verification date before data are used in a future translator.
Primary manufacturer source
Yellowberry sizing/catalog source — checked August 21, 2026.