Cobalt Rose Fit Guide

Although you may already know how to measure your bra size, The Cobalt Rose wireless bra sizing is more flexible than standard underwire bras and runs FULL. Follow our bra size calculator guide to ensure proper band and cup measurement. Note: For a more snug fit, you may want to try one size smaller than the chart indicates for you.*

Fit icon bust

How to calculate your band size.


First, make sure you are wearing a bra with no padding. If your bra has removable padding, take it out before you begin measuring.

Take your underbust measurement just under the breast tissue, called the underband. Take deep breaths; holding your breath is a common mistake that may result in you getting the wrong bra size. Hold the tape measure firmly, with secure tension. Aim for a snug fit. If your band measurement is in between numbers, then round up to the next inch. See figure 1.

The measurement you now have is your bra band size. If your band size measurement is an odd number, round up to the next even-numbered band size.

Fit icon bust

How to calculate your cup size.

You now need to take a second measurement, to determine your cup size (bust size). To determine your cup size, measure around the fullest part of your bust. See figure 2.

To calculate your cup size, take the difference between your full bust measurement and your underband measurement. See the bra size chart below..



Measure around the fullest part of your bust. Fig.2


Wrap your measuring tape just under the bust. This is also your band size. Fig.1



This is the difference between your full bust measurement and your underband measurement. Compare the difference, in inches, to the corresponding cup letter in the following chart.


Corresponding Cup Size

1" ───────── A

2" ───────── B

3" ───────── C

4" ───────── D

5" ───────── DD

6" ───────── F

*Note that this size chart and video are a guide, and the correct bra size may vary customer to customer. Our bras are created differently than what you may be used to accommodate for fuller busts, and our current sizing tends to run large. For this reason, we recommend taking a size smaller than your usual size. For example, if you measure a 36C, a sister size of 34D may be a better fit. Please don’t hesitate to contact us for help.

Cobalt Rose Bra Sizing Tutorial

Video Transcript

Hi ladies, I’m Carina Ramirez Cahan, Co-Founder of Cobalt Rose company, and I’m here to show you how to properly measure yourself so you can figure out what your bra size is.

First, you take a measuring tape, wrap it around yourself just under the bust. You want it snugly. Make sure that you’re wearing a non-padded bra, but you must wear a bra. Wrap it right underneath your bust—this is the underbust area—and measure. Mine comes out to 32.

If you’re an even number that’s fine, if you’re an odd number, you’re going to have to round up to the next number. Make note of that measurement.

Next, you’ll take that measuring tape, you’re going to measure around the fullest part of your bust, make sure that it is even here.

Then, at the fullest part—again, snugly—take that measurement. Mine comes out to between 36 and 37, so I’m going to round up to 37.

Then, make note of that, look at the guide, and determine what might be your best bra size. Thank you.

Reach out to us at with your measurements and we’ll happily help you find the perfect bra size for you.