I have been fitting and styling women since 2007, and here is the single most important thing I have learned: most women are wearing the wrong size. Not because they measured themselves incorrectly on some website, but because bra fitting is not actually about numbers. It is about shape, construction, and how a particular piece is built to hold your particular body. Two bras in the exact same size can fit completely differently depending on the brand, the cup shape, and the engineering of the band.
So if you have ever stood in a fitting room thinking you must be going crazy because one bra fits and another in the same size does not, you are not crazy. You are just paying attention.
Let me walk you through what a proper fit actually looks and feels like, and what the most common mistakes are.
The band is doing the work
This is where almost everyone goes wrong. The band, not the straps, should be doing about ninety percent of the heavy lifting. The band is the foundation. If it is too loose, the whole bra shifts upward in the back, the cups fall forward, and suddenly your straps are digging into your shoulders trying to compensate for a band that is not holding anything in place.
A properly fitted band sits level all the way around your torso. It does not ride up in the back. It does not creep toward your neck over the course of the day. It stays put, firmly but not painfully, because it is the anchor everything else hangs from.
When you try on a new bra, start on the loosest hook, not the tightest. Bras stretch over time, and you want room to tighten the band as the elastic relaxes. If you are already starting on the last hook, the bra is too big in the band or it is simply worn out.
The cups should contain you, not reshape you
Your breast tissue should sit fully inside the cup. Nothing should spill over the top of the center gore, nothing should bulge out the sides near your armpit, and the underwire should sit flat against your ribcage all the way around. If the wire is floating away from your body in the center, the cup is too small. If you have empty space at the top of the cup, it is either too big or the wrong shape for your breast tissue.
And this is the part nobody tells you: breast shape matters as much as size. A full, rounded breast and a softer, more projected breast can measure identically and need completely different cups. One woman might overflow a demi cup while another pools at the bottom of the exact same size. This is why trying on bras is nonnegotiable, and why a fitter who understands construction can save you years of frustration.
The center gore should tack
The center gore is that little piece of fabric between the cups. In a proper fit, it lies flat against your sternum. If it is floating or bowing away from your body, the cups are not deep enough or the band is not tight enough to pull everything into place. A gore that does not tack is one of the most reliable signs that something is off.
The straps are the finishing touch, not the main event
Straps should stay in place without digging. If they are leaving red marks or falling off your shoulders, the band is likely too loose and the straps are overworked. That said, some women have narrower or more sloped shoulders, and in those cases a different strap placement or a racerback conversion can help. But the root cause is almost always the band, not the straps themselves.
Use the scoop method
When you put on a bra, lean forward and scoop all of your breast tissue into the cup from the sides and underneath. Do not just let the bra sit where it lands. Breast tissue migrates over time, especially if you have been wearing ill-fitting bras, and you want everything centered and lifted into the cup where it belongs. This one step changes the fit dramatically, and most women skip it entirely.
You probably need more than one bra
I know, I know. But hear me out. You do not own one pair of shoes and expect them to work for every occasion. Bras are the same. The seamless t-shirt bra that disappears under a thin knit is not the same bra you want for a structured evening dress. The plunge bra that works with a deep neckline will not give you the same support as a full-cup balconnet under a tailored blazer. And your body changes. Weight fluctuates, hormones shift, pregnancy and nursing change everything. A woman who fits a 34D in March might be a 32DD by September, or a 36C after the holidays. This is normal. It is not a failure. It is just a body being a body.
You may be different sizes in different brands
This is not a flaw in your body. It is a reality of manufacturing. A French house like Lise Charmel builds cups with a different architecture than an American brand like Scarlett Gasque. The wire shape, the projection, the placement of the strap, the stretch of the band, all of it varies. You might take a 34C in one collection and a 32D in another, and both can be correct. This is why I keep a size on file for every client, but I also note which brands and cuts work for her specifically. Fit is not a number. It is a relationship between a garment and a body, and it takes time to get right.
When to come see me
If your bra rides up in the back, if your straps dig, if you are spilling out or pooling in, if you have never been professionally measured, or if it has been more than a year since your last fitting, it is time. Most women who come to Sunday Best leave in a size they did not expect, and it is the right one. Not because I have a magic eye, but because I have spent years learning how these pieces are built and how they interact with real bodies.
Book an appointment. Bring the bras you are currently wearing, even the ones you hate. I will tell you what is working, what is not, and why. And I will find you something better.