Cup too big? How to use the included insert

The bra extender that comes with your bra only widens the band. Not the cup. If your cup feels too big, the problem is usually a band that's too tight and pulling the cup along with it, or your cup really is too big, and an extra hook won't fix that one.

In this article you'll find two simple self-tests to check which one is going on, when an extender actually solves it, and when you're better off trying a different size.

Why does your cup feel too big when the size is actually right?

This is the most common reason: it's not your cup, it's your band. When the band is too tight, it pulls the cup tight across your chest along with it. The fabric of the cup never gets the chance to shape itself to your body, so it puckers or bulges at the top. That looks and feels like a cup that's too big, even though the size on paper is correct.

Self-test: slide two fingers under the band at your back. If that's a snug fit with some resistance, the band is right. If you can easily fit three fingers or more under it, the band is actually too loose and the problem is probably in the cup itself. If you can barely fit one finger under it, the band is too tight, and that's the real cause of your "too big" cup.

How to know for sure your cup is really too big

Sometimes it's not an illusion caused by a tight band. Sometimes the cup really is too roomy for your shape, no matter what the band is doing. You'll notice puckers in the fabric that don't go away when you adjust the straps, a top edge that pulls away from your skin, or breast tissue that sinks down instead of filling the cup.

Self-test: pinch the fabric at the top of the cup between your thumb and index finger. If you can grab more than an inch of fabric without your breast moving with it, the cup is too big. If there's barely any fabric to grab, the cup actually fits and the problem lies elsewhere, usually the band.

Of the nearly 2,900 women we asked about their biggest bra frustration, 8.2% named the wrong size or cup. That's not a small number. Cup and band don't line up as often as you'd think, even with brands you've bought for years. There's no shame in measuring yourself again after wearing the same size for years.

Does your band stretch out on its own after a while?

Yes, that just happens. Elastane stretches with wear and washing, and a band that fit perfectly at first can feel looser after a few months. That's exactly when a lot of women reach for an extender, when really it works the other way around: if your band has stretched out, you need it tighter, not wider. An extender is meant for a band that was too tight from the start, not one that has since loosened up.

Self-test: close your bra on the inner row of hooks instead of the outer one. Does it fit well now? Then your band had simply stretched out, and you don't need an extender, just the tighter setting on your own closure. Rotating between a few bras over several days also gives the elastane a chance to recover, so the band stretches out more slowly.

When an extender actually helps

Did the first self-test show that your band is too tight? Then an extender is made for exactly this. It hooks onto your existing closure and gives your band an extra inch or so of room. The band sits looser around your ribs, the cup gets the space to shape itself naturally instead of being pulled tight, and that "too big" feeling in the cup often disappears on its own.

A bra extender solves this nicely: the cup ends up fitting just right, and the band gets a little extra room around the ribcage.

How to use it:

• Hook the extender onto the outer row of hooks on your bra, on both sides.
• Close your bra on the extender from now on instead of its own closure.
• Run the two-finger test again: a little resistance under the band, no pressure marks on your back.

This works especially well if you've recently lost weight, if your bra has stretched slightly after a few washes, or if you fall between two band sizes. Our Daily Essential Bra also has a 3-inch wide band that spreads the weight on your shoulders over a larger area to begin with. That means you don't have to pull the band as tight to feel supported, and the cup is less likely to get in your way. That wider band is also exactly why you'll need an extender less often. The fit feels roomier right from the start.

When an extender isn't the answer

Did the pinch test show there's really too much fabric in the cup, separate from the band? An extender won't help there. It only widens the band, not the cup. A bra with a band that now fits looser but a cup that still puckers calls for a different size or cup letter, not an extra hook.

Say you currently wear 38C and the cup keeps puckering at the top even with a looser band. Try 36D instead of 38C: the same cup volume, but a band that fits better. If the cup still feels too roomy after that, you're probably just a cup size too big, and 36C will likely work better. When you re-measure, measure snug just under your bust for the band size first, then work out your cup size from the difference with your bust measurement, not the other way around.

Our Daily Essential Bra's size chart runs all the way up to cup H, across 12 sizes from S to 3XL+. The memory foam cups shape themselves to your breast instead of the other way around, which helps with exactly that puckering and gaping so many women run into with a cup that doesn't quite fit. If you're torn between two sizes, go ahead and order: our 30-day perfect fit guarantee lets you exchange it if it's not quite right.

Not sure if you're dealing with an optical illusion instead of a genuinely too-big cup? Check out this article on a cup that looks bigger than it is. Running into the size chart over and over? Take a look at our findings in Monavida bra sizes: often runs big or small.