Rosey Isle Size Guide

How to Measure Your Bra Size

Finding the perfect fit shouldn’t feel complicated—let’s keep it simple and effortless, just follow the simple steps below.

If you need a little extra help, reach out to us anytime at info@roseyisle.com We’re here to make it easy.

Wrap a soft measuring tape snugly around your ribcage, just under your bust where your bra band naturally sits. Keep the tape level with the floor, not too tight, not too loose—just comfortably secure.

This is your band measurement. Use the chart below to find your band size.

Next, measure around the fullest part of your bust. Make sure the tape is smooth and level, resting gently without pressing into your skin.

Step 3 Find Your Size

Subtract your underbust measurement from your bust measurement.

The difference between these numbers determines your cup size.

  • Smaller difference? A smaller cup size like A or B.
  • Larger difference? A fuller cup size like D or beyond.

Use your band size and cup size together to find your perfect fit.

Not Sure? That’s Okay.

Fit is personal. If you’re between sizes, size down for a snugger feel or up for a bit more ease.

And if it’s not perfect? No stress—we offer easy exchanges within 30 days.

Because confidence starts with comfort.Welcome to Rosey Isle.

Step 4 Adjust for the Perfect Fit

Sometimes, finding the right fit takes a little extra fine-tuning. If your bra feels almost right but not quite perfect, a few small adjustments can make a big difference.

Common Fit Tweaks:
  • Straps Slipping Off?
    Your cup might be too big, or the band too loose. Try tightening the straps first. If that doesn’t help, consider sizing down in the cup or band.
  • Side Spillage or Top Overflow?
    This usually means the cup is too small or the band is too tight. Try going up a cup size or loosening the band slightly.
Navigating the Size Chart:
  • Band Size: Increases as you move left to right across the chart.
  • Cup Size: Increases as you move top to bottom down the chart.

It’s not just about the numbers—it’s about how you feel. And when your bra fits like it should, you’ll know.

Sister Sizing: Your Fit’s Secret Shortcut

If your current size feels a little off, sister sizes can help you find that perfect balance. Bra sizes that share a row are sister sizes.They have the same cup volume but different band sizes, offering more flexibility in fit.

How Sister Sizes Work:
  • Need a Looser Band?
    Move up a band size and down a cup size to maintain the same cup volume.
    Example: If 75B (34B) feels tight, try 80A (36A).
  • Need a Snugger Band?
    Move down a band size and up a cup size to keep the fit consistent.
    Example: If 75B (34B) feels loose, try 70C (32C).
Why Sister Sizes Matter:

At first glance, sizes like 36C, 38B, and 40A might seem completely different, but they actually share the same cup volume. The same goes for sizes like 38H, 40G, 42F, and 44E.

Finding Your Perfect Fit: Band, Cup, and Straps

Cup Size: Where Comfort Meets Shape

The Basics:
Think of your bra cup like a cozy little nook, gently holding you without gaps or spills.

  • Just Right: Smooth, snug, and comfortably hugging your natural shape.
  • Too Big? You'll notice extra space or wrinkles.
  • Too Small? Spillage from the top or sides, feeling restrictive.

Quick Tip:The center of your bra (gore) should sit flat against your chest. If it’s floating, your cups might be too small.

Band Size: The Unsung Hero of Support

What You Need to Know:
The band is the foundation of your bra, providing about 70% of the support.

  • Just Right: Fits snug on the loosest hook with room to adjust over time.
  • Too Loose: Rides up your back, losing support.
  • Too Tight: Restricts breathing or leaves deep marks on your skin.

Quick Tip:The band should stay level around your body, like a horizon line without peaks or dips.

Strap Adjustments: Light Support, Big Impact

Details:
Straps aren't the main source of support, but they help fine-tune the fit.

  • Just Right: Sits snugly on your shoulders without digging in or slipping off.
  • Too Loose: Slips off easily, lacking support.
  • Too Tight: Leaves noticeable marks, causing discomfort.

Quick Tip:Adjust the straps to sit comfortably in the middle of your shoulders, not too close to your neck or falling off.

Find the Perfect Fitting Bra for Your Breast Shape

There are no bad boobs, only bad bras. Just like shoes or jeans, only some people will fit comfortably into the same style!

Knowing your breast shape can help you select the right style for it.

Better fit = more comfortable, so what’s not to love? Let’s get into it.

ASYMMETRIC

It’s common to have asymmetric breasts in combination with any of the other shapes. 40 percent of women have breasts that differ in size, ranging from a slight asymmetry to an entire cup size difference.
FOR YOUR SHAPE: Try bras with removable inserts if you’d like to even out your natural shape.

ATHLETIC

This shape features wider, more muscular breasts with less tissue. Cup gaping tends to be a common issue for Athletic shapes due to the lack of volume up top.
FOR YOUR SHAPE: Just-right coverage is key for a smooth look.

BELL

Slimmer at the top and fuller at the bottom, this shape typically characterizes women with larger cup sizes. Bell shapes may commonly experience overflow with minimal coverage styles like balconette or demi.
FOR YOUR SHAPE: Bras with full coverage are a great choice.

RELAXED

With lax tissue and nipples that point downwards, folks with this shape tend to have longer breasts that hang.
FOR YOUR SHAPE: Try styles with a slightly shorter cup for more fullness at the top such as those in our collection of bras for relaxed breasts.

EAST WEST

Like the name implies, East West shape is characterized by wide-set breasts that gravitate away from the chest center. The nipples tend to point outwards in opposite directions. Those with this shape may find it is more difficult to achieve cleavage with certain tops.
FOR YOUR SHAPE: styles that are full coverage and help bring your breasts up and together are great when shopping for bras for East West breasts.

ROUND

Equally full at the top and bottom, often round shapes find they only need a little coverage and support, making many padded bras unnecessary.
FOR YOUR SHAPE: Most styles will work well for your shape, but explore wireless bras for days when you only want light support and balconette styles for when you want an ultra-flattering fit. They’re all in our curated collection of bras for round breasts.

SIDE SET

Similar to East West shapes, side set shapes tend to have a wide center gap but fuller-shaped breasts with nipples that face more forward.

FOR YOUR SHAPE: Explore bras made to naturally lift and draw your breasts closer together, such as those in our collection of bras for side set breasts.

SLENDER

If you have thin breasts with nipples that point downwards, you may have this shape. Slender shapes are typically smaller in size, with breasts that are slightly longer than they are wide.

FOR YOUR SHAPE: Explore bras made to give you a natural, flattering lift in our collection of bras for slender breasts.

TEARDROP

Like bell shapes except rounder, while teardrop shapes are round, they are slightly less full at the top. If you have this shape, you may experience cup gaping with full-coverage bras.

FOR YOUR SHAPE: A wide variety of styles will suit your shape, but for more fullness up top, try a balconette style. Our collection of bras for teardrop breasts features a wide range of silhouettes that will enhance your shape.

Bra Sizing FAQs

Bra-blems can happen. Close, but not quite? A few simple fit tips might be all you need for that perfect feel.

If your straps fall down, your cup size may be too big.

They’re being pulled away from your body because the bra cup cannot lay flush.

If your straps dig in, your band may be too loose.

Are your straps cranked super tight? Your band and cup aren’t holding on (and holding up), so the straps are carrying too much weight.

If you fix it often/your band moves, your band may be too loose.

A band that has room to move is too large. That too-large band may be overcompensating for a too-small cup.

If there’s puckering in the cups, your cups are too large.

If the cup cannot sit flush against the body, it will buckle to try to help fill the space. A lesser coverage style may work if it is very minor. Otherwise, you may need to size down.

If the center gore stands away from your body, your cups are too small.

The cups aren’t overflowing out of the sides or over the top, so it may appear that the bra fits. However, if the center where the cups meet does not touch the body, that means the breast tissue is pushing away.

If there’s poking, your cup size may be incorrect.

One possibility is the wire is unable to properly cup the underside the breast and is poking because it’s too small. On the other hand, a too-large copy gives the wire the ability to move, which can also cause poking.