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Hi, this is BlackSeaTribe — a brand inspired by the carefree spirit of coastal life and the fast pace of the city. We believe that comfort starts with the little things. And the right bra is exactly that “invisible hero” of your day — giving you confidence, beauty, and freedom of movement.
The statistics are disappointing: more than 70% of women wear the wrong bra size. And it’s not just about aesthetics. It affects posture, well-being, even mood. The cup size is one of the key parameters that often raises questions. We’ll help you figure it out simply and without unnecessary fuss.
This article is a quick guide that will show you how to find your perfect size. Not the one that’s “ideal” in someone else’s eyes — but your own, personal, comfortable fit that works for you.
When you see a size on the label — like 75B or 85D — it’s not just a random code. It’s quite logical and simple: the number indicates your underbust measurement, and the letter represents the cup size.
Measured in centimeters. For example:
This is the base measurement. All other parameters build from here.
This is defined by the difference between your bust and underbust measurements.
The larger the difference, the further along the alphabet the letter goes.
For example:
(See detailed table below)
Different countries use different labels. In Europe, a system similar to Ukraine’s is most common: number + letter. In the US, the markings can differ, and cup widths may vary. But the idea is the same: underbust measurement + cup depth. That’s why it’s important to know your actual measurements — not just your “usual size.”
In the next section — how to measure everything correctly at home. No stress, no calculator required.
To find your perfect bra size, you don’t need anything complicated. Just a soft measuring tape and a bit of calm. The best place to do it is at home, in front of a mirror.
Start with the underbust measurement. The tape should fit snugly but not too tight. It must be parallel to the floor — not slanted or tilted. Round the result to the nearest standard size: if it’s 74 cm, that’s a 75; if it’s 79, go with 80.
Next — measure around your bust. To avoid distortion, it’s better to wear your usual bra without push-up. Place the tape around the fullest part of your bust. It shouldn’t be tight or loose — just follow your natural shape.
Now for the most important part — calculate the difference between the second and first measurements. This difference determines the cup size. For example, if your underbust is 75 and bust is 90, the difference is 15 cm. That means you most likely need a B or C cup, depending on the brand and cut.
A small note — some manufacturers have their own fit specifics, so these numbers are a guide, not an absolute rule. But knowing your real measurements makes it much easier to find a bra that fits perfectly.
Cup size is not just a letter. It’s the difference between your bust and underbust.
If the difference is about 10–12 cm — that’s an A cup.
13–15 cm — B cup.
And so on: C, D, E, F. Every 2–3 cm adds a new letter. And yes, larger sizes exist — and that’s absolutely normal.
If you’ve bought lingerie abroad, you may have noticed: the same measurements can be labeled differently. For example, size 75B in Ukraine corresponds to 34B in the US or UK. That’s because there, the number refers to the underbust measurement in inches. But the core concept remains the same: underbust + cup depth.
At BlackSeaTribe, we use the European system — it’s logical and convenient because it’s based on centimeters. So once you measure yourself correctly, you’ll know your size for sure and easily find lingerie that fits not just by guesswork, but perfectly.
A well-fitted bra is one you don’t want to take off after 10 minutes. It doesn’t squeeze, rub, or bounce with you — you just… forget about it. Because it becomes a part of you.
A properly fitting band hugs your body, doesn’t ride up, and doesn’t leave marks. It’s actually the main support — not the straps. If the back rides up, the band size is probably too large.
Straps should be adjusted to provide support without digging in. If they leave marks — that’s a sign to loosen them or reconsider the overall size.
The cups should fit smoothly — no gaps, no overflow. If the edge of the cup cuts in — it’s probably too small. If there’s space between the fabric and your body — it might be too big.
And one more thing — the center panel of the bra, the part between the cups, should lie flat against your body. If it’s floating — something’s off with either the cup size or the band.
But above all — it’s not about the centimeters. It’s about how you feel. In a properly fitted bra, you should feel comfortable with every movement. No discomfort, no urge to take it off — even at the end of a long day.
One of the most common mistakes is choosing a band that’s too small. It may feel like it “holds better,” but in reality, it just squeezes. A feeling of pressure, marks on the skin, and discomfort in the back — all of these are signs that you need to go up in band size.
The opposite issue is choosing a cup that’s too large. Often, women do this thinking it will be “more comfortable” or to “have some room.” But such lingerie doesn’t fit securely, offers no support, and looks sloppy.
It’s also common to wear a cup that’s too small. It compresses, creates visible lines under clothing, and simply doesn’t look natural. If the fabric of the cup seems to “cut into” your shape — it’s definitely a sign to try a different size.
Another factor many forget is asymmetry. Most women have it — for some, it’s barely noticeable; for others, more pronounced. In this case, it’s best to choose the cup size based on the larger side and use a pad to balance the smaller one, or choose styles with a flexible edge.
And remember: the wrong bra isn’t just uncomfortable. It affects posture, how your clothes look, and even your mood. Don’t settle — find your perfect size. And believe us — it’s absolutely possible.
Your bra size isn’t permanent. The body changes — and that’s completely normal. Stress, weight fluctuations, workouts, hormonal changes, pregnancy, breastfeeding, or simply age — all of these can affect your measurements.
Sometimes, a bra that fit perfectly a year ago suddenly feels too tight. Or the opposite — it becomes loose. If you notice the cups no longer fit the same, or the band rides up — it’s time to remeasure.
At BlackSeaTribe, we recommend checking your measurements at least once every six months. It’s simple, quick, and helps avoid mistakes. Especially if you’re ordering lingerie online or made-to-measure — like we offer.
Pay attention to how it feels: discomfort, a shift in fit, needing to adjust the straps — these are signals. Your body evolves, and your lingerie should keep up with it.
The BlackSeaTribe collection is lingerie with character. We create designs that highlight your individuality while remaining a comfortable part of your everyday rhythm. Our inspiration comes from the Black Sea region — with its sense of freedom, depth, and light.
Each piece features high-quality European materials: soft microfiber, delicate lace, light mesh, viscose, polyamide, or cotton. We don’t use ruffles or unnecessary decorations — just clean, thoughtful design that highlights your shape and leaves space for you.
All bras are made to order — in the size you choose during checkout. That means every piece is tailored to your body’s specific measurements. No compromises — just precision and comfort. Production takes 3–5 business days, after which we ship your order.
Payment is easy: by card, bank transfer, or cryptocurrency — yes, we welcome modern formats.
And just to be clear: lingerie belongs to the category of intimate goods and is not eligible for exchange or return. But thanks to precise measurements and pre-order consultations — you’ll get exactly what you need.
Cup size is not just a letter on a label. It’s about how you feel, your freedom of movement, confidence, and comfort in everyday life. Wearing the right bra isn’t about fashion — it’s about self-care.
Knowing your measurements means having the freedom to choose. Not settling for discomfort, but having what fits. Ideally, lingerie should feel like nothing — while giving support and balance.
At BlackSeaTribe, we believe that every woman deserves lingerie made just for her. That’s why each bra is made to your measurements and preferences.
Visit blackseatribe.com/en — browse our styles, measure yourself, and treat yourself to comfort that stays with you for the long haul. If you need help choosing a size — message us, we’re always here.
BlackSeaTribe is more than clothing. It’s a feeling you want to wear. Every day.
