My Bra is Too Loose: Fixing This Common Bra Fit Issue

Finding the right bra can feel like a challenge. After all, it's normal for bodies to fluctuate and bras themselves can stretch out over time. That's how you find yourself in a situation where, suddenly and seemingly overnight, your once perfect-fitting bra no longer fits. 

Here's how to tell if your bra is too loose and how to identify your correct bra size.

Signs your bra is too loose

Your bra moves when you move

If your bra moves up your back or sides when you lift your arms, it's too loose.

You have gapping in the cups

If your breast tissue isn't filling up the entire space of the bra cup, you'll need to go down in cup capacity.

Your straps are slipping

If your straps are sliding off your shoulders, you either need to tighten them or consider going down a size. 

When to use sister sizing

Sister sizing is a sizing methodology used to change the fit of your bra band without changing the volume of your cups. Cup size actually corresponds to the ratio of your band and your bust measurements (not just your bust size), so when you change the size of the band, you must also change the size of your cup in order to keep the capacity the same. 

You can find your sister size in two ways: 

1. Go up one band size, and down one cup size. This will make your band looser without changing the volume of your cups.

2. Go down one band size, and up one cup size. This will make your band tighter without changing the volume of your cups. 

In this example, let's say you're wearing a 36C. You love the way the cups fit, but the band is too loose. To fix this, you would go down to a 34 band and up to a D cup. 

When to size down

If your band and your cups are both too big, then you'll go down a full size. If your current size is a 36C, you would go down one size to a 34C. This change will make both your band and cup smaller.

When to adjust your bra

If your bra is just slightly too loose and changing sizes feels too extreme, you probably just need to tighten the band and straps. This adjustment should fix the issue.

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