How UBBRA makes fit recommendations

UBBRA uses a conservative decision tree. The goal is not to calculate a mythical perfect size; it is to choose the next comparison that teaches you the most with the least unnecessary change.

1. Separate the band from the cups

A band that feels tight while worn normally may be reacting to small or shallow cups. Fit Rescue therefore routes a “tight band” answer through a band-only test before confidently recommending a larger band.

2. Account for garment wear

If a bra used to fit and now rides up, stretched elastic is a competing explanation. UBBRA asks about garment condition so an old band does not automatically teach you to buy a smaller size.

3. Preserve approximate cup volume when changing bands

When a band moves one step, UBBRA uses sister-size logic as a comparison tool: a smaller band normally needs a larger cup label to keep similar cup volume, and a larger band normally needs the opposite. This is approximate, not a cross-brand guarantee.

4. Treat shape as a first-class variable

Top-only gaping, a too-wide wire, a wire that slides down, a very tall cup, or a painful gore can be construction problems. UBBRA can therefore keep the current nominal size and recommend different geometry first.

5. Detect conflicting signals

For example, spilling can suggest more cup room, but a wire that is already too wide makes a straightforward cup-size increase questionable because many larger cups also use wider wires. UBBRA then prioritizes a deeper/narrower construction before adding volume.

6. Avoid false precision in US cup labels

US cup lettering varies across brands. Fit Rescue can use relative volume steps, but it does not pretend that every manufacturer uses the same label progression.

Common terms

• Band: the part that wraps around the torso and anchors the bra.
• Cup volume: the amount of space in the cup; the letter only makes sense together with the band.
• Gore: the center panel between the cups on many bras.
• Wire width/height: how far the underwire travels around the side and how high it rises.
• Cup depth: how much forward space the cup provides, especially near the bottom.

Health boundary

UBBRA addresses garment fit only. Persistent pain, numbness, skin injury, or a new or concerning body change should be discussed with a qualified healthcare professional.

Reference points

UBBRA’s general fit checks are consistent with public fitting guidance such as Bravissimo’s fitting guide and Wacoal’s 5 Points of Fit. These organizations do not endorse UBBRA, and UBBRA does not copy their proprietary product data.

Methodology last reviewed: 2026-09-15.