You've put on your bra, looked in the mirror, and noticed something doesn't seem quite right.

Maybe the underwire isn't sitting flush against your body. Perhaps there's a gap between the wire and your breast tissue. Sound familiar?

The good news is that this is a very common bra fitting issue and, in most cases, it's easily fixed.

Let's explore why it happens and what you can do about it.

First Things First: Your Underwire Should Sit Flat

When a bra fits properly, the underwire should sit comfortably around the entire breast tissue and lie flat against your ribcage.

It shouldn't:

• Float away from your body
• Dig into your breast tissue
• Sit on top of your breasts
• Poke or pinch

If there's a noticeable gap between the wire and your body, your bra may not be giving you the support it should.

Your Cup Size Might Not Be Quite Right

One of the most common causes of underwire gaping is wearing the wrong cup size.

The Cups Could Be Too Large

If the cups are too big, there may be extra space that your breast tissue isn't filling. This can cause the underwire and cups to sit awkwardly, creating gaps.

Signs include:

• Wrinkling in the cups
• Gaping fabric
• Lack of support

The Cups Could Be Too Small

Surprisingly, cups that are too small can also cause fit issues.

When breast tissue doesn't fit comfortably inside the cups, the underwire may be pushed away from the body rather than sitting where it should.

Your Band Might Be the Problem

Your band is responsible for around 80% of your bra's support.

If the band is too loose, the bra can shift and move throughout the day, causing the underwire to pull away from your body.

Signs your band may be too loose:

• It rides up at the back
• You can pull it far away from your body
• The straps are doing most of the work

A snug, supportive band helps keep the entire bra sitting where it belongs.

The Bra Style May Not Suit Your Breast Shape

Not every bra style works for every breast shape and that's completely normal.

For example:

• If you have fuller-bottom breasts, a full coverage bra may gape at the top.
• If you have wide-set breasts, some styles may struggle to sit flat against the chest.
• If you have shallower breasts, certain moulded cups may not contour properly.

Finding a bra designed for your breast shape can make a huge difference.

Bras with Side Support Can Help

For women with wider-set or east-west breasts, bras featuring side support panels can be incredibly helpful.

These styles gently guide breast tissue forward and towards the centre, helping the underwire sit more comfortably against the body while creating a more balanced silhouette.

Your Bra Could Simply Be Worn Out

Even the best bras don't last forever.

Over time, bands stretch, cups lose their shape, and underwires can become distorted.

If you've had your bra for a while and it's no longer fitting the way it once did, it may be time for a replacement.

Signs your bra may be past its best:

• Stretched-out band
• Misshapen cups
• Poking underwires
• Reduced support

The Importance of a Professional Bra Fitting

If you're constantly experiencing gaping, discomfort, or underwires that won't sit correctly, a professional fitting can be a game changer.

Many women discover they have been wearing the wrong bra size for years.

A proper fitting can help you find:

• The right band size
• The right cup size
• Styles suited to your breast shape
• Better overall support and comfort

The Bottom Line

A gap between your underwire and your breast usually points to a sizing, fit, or style issue rather than anything wrong with your body.

The solution may be as simple as adjusting your size, trying a different bra style, or replacing an older bra that's lost its support.

The right bra should sit comfortably against your body, support your bust beautifully, and make you feel confident every time you put it on.

Because when your bra fits properly, everything feels better.