More than one woman in our Coffee Conversations described a frustration a lot of us will recognise.
She’d found a sports bra comfortable enough to become her go-to: easy to put on, seemed to sit right from the start.
Only to have the underband fold and ride up midway a workout. She finds herself pulling it back down, again and again, without ever quite fixing it.
It’s a strange thing - a sports bra that feels fine putting it on, and doesn’t hold up ten minutes into the activity it was actually bought for. The real question isn’t whether the sportsbra fits. It’s whether it was ever measured for what happens once you start moving.
The fitting room is not the real test
The strange thing about this kind of problem is that it rarely appears in the fitting room.
Standing in front of a mirror, everything can seem perfectly reasonable. The bra feels secure. Nothing shifts. Nothing feels obviously wrong.
But a fitting room is a relatively easy environment for a sports bra.
The real test starts later.
A sports bra is built for movement. It is worn while reaching, twisting, lifting, stretching and moving through a workout. Every one of those actions places different demands on the garment than standing still ever can.
That is why a sports bra can feel completely fine getting dressed and still behave differently once a workout begins.
The question is not whether the bra felt comfortable in the first few minutes. The question is whether it can maintain that fit once movement enters the equation.
When a band folds, rolls or starts creeping upward during movement, what you're seeing isn't just a fitting-room problem. You're seeing how the garment behaves once the conditions change.
What we measure instead
To understand that difference, we don't stop at how a bra sits on the body when everyhing is still. Here at AL, every size is built using four measurements:
· Under-bust at rest
· Under-bust stretched
· Bust at rest
· Bust stretched
The stretched measurement is particularly important because it helps us understand how a bra behaves when tension is introduced.
A garment may sit comfortably against the body when everything is still, yet respond very differently once movement begins. Measuring only at rest captures part of the picture. Measuring both at rest and stretched gives us a fuller understanding of how the bra is likely to perform throughout the day.
This approach takes more work, but it reflects the reality of how bras are actually worn. We are not measuring for the fitting room alone. We are measuring for the hours that follow.
Why we don’t use cup letters
We also do not size by cup letter.
Instead, sizing is garment-level, because a cup letter on its own does not tell the full story.
The same cup letter can exist across different band sizes and represent very different proportions. Looking at bust and under-bust measurements together, both at rest and stretched, gives us a clearer picture of fit than a single letter can provide on its own.
Rather than relying on a shorthand label, we focus on the measurements that directly influence how a bra fits and performs.
Why we care about what happens next
Most bras can tell you how they feel in the first minute.
The harder question is what happens twenty minutes, or later in the day.
What happens after repeated movement, stretching and recovery? What happens when the garment has to perform, instead of simply sitting against the body?
That is the question the stretched measurement helps us explore.
It gives us another way of understanding how a garment responds once tension is introduced, rather than assuming the fit seen in a fitting room will remain unchanged throughout a workout.
No measurement can predict every experience for every woman. Bodies move differently, workouts vary, and preferences are personal. But if the goal is to understand how a sports bra is likely to perform beyond the first few minutes, movement has to be part of the conversation.
Because when it comes to activewear, the fit that matters most is not how a garment feels standing in front of a mirror. It is how it feels when you are actually using it.
See How We Measure
Curious what your measurements look like at rest and stretched?
Our Size Guide shows exactly how we measure, why those additional measurements matter and how to find your recommended size.
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