The Common Bra Mistake Many People Make Without Realizing

A recent viral TikTok from stylist Kenzie has sparked a surprisingly heated conversation — and it’s about bras.

In her video, Kenzie, a former employee at a high-end lingerie brand, makes a bold claim:

“80% of you watching this video are wearing the wrong bra size.”

That statement stopped people mid-scroll. And judging by the comments, it hit home.

But is it really that common? And more importantly — how do you know if you’re wearing the wrong size?

Let’s break it down.

Why Proper Bra Fit Actually Matters

Wearing the correct bra size isn’t just about how your outfit looks. It directly affects:

• Comfort
• Posture
• Back and shoulder health
• Skin irritation
• Confidence

An ill-fitting bra can cause chronic back pain, shoulder grooves from tight straps, underwire digging, and even tension headaches. Over time, poor support may affect posture and create unnecessary strain.

The right fit should feel supportive — not restrictive.

Signs Your Bra Doesn’t Fit Properly

According to Kenzie, there are some clear warning signs that your bra may not be doing its job.

1. The Band Test

The band should sit straight and level across your back — not riding up.

You should only be able to pull it away from your body about two inches. If it stretches much farther, it’s too loose. If it feels suffocating, it’s too tight.

Fun fact: The band provides most of the support — not the straps.

2. Cup Clues

If you’re experiencing:

• Spillage over the top
• Underwire digging into breast tissue
• Side bulging

Your cup is likely too small.

On the flip side:

• Gapping
• Wrinkling
• Sagging fabric

May mean the cup is too large.

3. Strap Misconceptions

Many people think straps do the heavy lifting. They don’t.

If your straps are digging painfully into your shoulders, it usually means your band isn’t supportive enough. The band and cups should carry most of the weight.

The Part Most People Get Wrong About Sizing

One of the biggest takeaways from Kenzie’s video is something many people don’t realize:

Cup size changes with band size.

If you go down in band size, you typically go up in cup size to maintain volume. This concept — known as “sister sizing” — is often misunderstood.

For example:

• A 34C does not have the same cup volume as a 38C.
• If you move from a 36C to a 34 band, you may need a 34D instead.

This sizing relationship is one of the main reasons people end up in the wrong bra.

It’s Not Just Size — It’s Style

Kenzie also points out something eye-opening: there are more than 25 different bra styles, yet most stores focus on just a few.

You might be wearing:

• A T-shirt bra

When your shape might be better suited for:

• A balconette
• A plunge
• A full-coverage style

Different breast shapes require different structures. Finding the right style can instantly improve comfort and support — even if your size stays the same.

How to Measure Yourself at Home

If you’re curious whether you’re in the right size, here’s a simple starting point:

Step 1: Measure Your Band

Wrap a measuring tape snugly around your ribcage, just under your bust. Keep it level.

Step 2: Measure Your Bust

Measure around the fullest part of your chest. Keep the tape comfortably snug — not tight.

Step 3: Calculate Cup Size

Subtract your band measurement from your bust measurement.

The difference typically corresponds to cup size:

• 1 inch = A
• 2 inches = B
• 3 inches = C
• 4 inches = D
  (And so on.)

Keep in mind: This is a guide, not a guarantee. Trying bras on is still essential.

The Bigger Takeaway

The fact that so many people resonated with Kenzie’s viral video shows something important: bra fitting education isn’t as common as it should be.

Taking the time to:

• Re-measure
• Try new styles
• Reassess your fit

Can dramatically improve daily comfort.

Because at the end of the day, a bra should support you — not distract you.

And if you’ve been uncomfortable for years thinking it’s “normal”… it might just be the wrong size.