How to Find Your Bra Size and How to Fit Breast Forms for Crossdressers and Transgender Girls

Breast form and bra fitting

Finding the right bra and breast forms

The Breast Form Store has more than 25 years of experience fitting breast forms for transgender women, crossdressers, drag queens, non-binary persons and those who have been assigned male at birth.

We’re here to help you create the perfect feminine figure, from your foundation garments to your breast forms. Here’s how easy it is to get the perfect look:

Step 1
Get your measurements

Work with your body’s measurements to get the best fit

Step 2
Find your bra size

Figure out the perfect bra size and the cup size you want to be

Step 2
Choose breast forms

It’s so easy to choose the right style of breast forms for your body!

Step 1: Get your measurements

Taking your measurements is the foundation for the perfect fit

When it comes to finding out the best style of bra size and breast forms to wear, it all starts with your measurements. Knowing what you measure helps to make sure that your bra and breast forms are proportionate to your body, and help you look good.

What you need

  • A soft fabric tape measure
  • A mirror (if possible)
  • Pen and paper to write your measurements down

Things to watch when taking your measurements

  • Make sure that the tape is snug against the skin but not tight. You should not have skin on either side of the tape
  • Keep the tape measure parallel to the floor all the way around your body. It should not droop down or slide up your back
  • Using a mirror can help to make sure you are keeping the tape level
  • Do not use a metal tape measure or string to take your measurements; it will lead to an inaccurate result
  • Do not wear any breast forms or any bra when taking your measurements

Step 1: Find your underbust measurement

Using your soft tape measure, wrap it all the way around your body at your underbust, approximately 2 inches below your nipples. This is beneath the curve of your pec muscle or breast tissue,  as well as where your bra band usually sits.

Round the measurement to the nearest HALF INCH. Makes sure to write down the number!

Step 2: Find your overbust measurement

Using your soft tape measure, wrap it all the way around your body at the fullest part of your bustline. This is usually at the nipple line, although you may find it lower or higher depending on natural muscle growth.

Round this measurement to the nearest INCH. Makes sure to write down the number!

Step 2: Find your bra size

Getting the right bra size makes breast forms look natural on your body

Why your bra size matters

Figuring out your correct bra band measurement is a very important step in getting breast forms that will look the most natural on your body. The right size bra and breast forms will likely help you feel more feminine, and will help make it easier to ‘pass.’

Bra fitting is more of an art than a science. Estimates put that over 90% of all women are wearing the wrong size bra, so if you’re in the wrong size bra for your body, don’t dispair! You’re not alone.

Your bra band is not the same as your physical chest measurement. In fact, it is often the same size as your mens’ suit jacket size.

Another thing to keep in mind is that if you do not naturally have breast development, traditional guidelines on choosing the best bra size don’t always apply. For example, the ‘armpit’ measurement is almost always wrong when you do not have naturally developed breast tissue.

We have tailored all of our fitting and size charts to work better for cross dressers and transgender girls so that they can fit your skeletal structure more naturally.

Why the bra band is an important measurement

Actual breast size is always in proportion to your body. That’s why you can look at a woman who is 5’1″ and 100 lbs with C cup breasts, and her breasts will look the same size as a woman who is 5’11” and 180 lbs with C cup breasts. However, if you look at the breast itself, the taller woman will have a larger breast overall, because her body is larger.

Although there’s nothing wrong with wearing a bra size that’s diferent than what your body says you are, you’re likely to find that your breast forms will sit in an unnatural way on your body. They may be too narrow on your chest, making you look broader and wider. They may also be too spaced apart on your chest, giving the look of a ‘botched’ implant surgery. 

Wearing a bra that is the wrong size for your body means you are more likely to damage your breast forms! The additional pressure from a too-small bra may damage the breast form, or it may fall out of place if the bra is too big.

How to find your bra band size

Finding your bra band size is easy! Using your underbust measurement (that you have rounded to the nearest half inch), use this chart to find your standard bra band size.

Your underbust measurement is… Your bra band size is..
24 ½ – 26 ¼ inches 30 bra band
26 ½ – 28 ¼ inches 32 bra band
28 ½ – 30 ¼ inches 34 bra band
30 ½ – 32 ¼ inches 36 bra band
32 ½ – 34 ¼ inches 38 bra band
34 ½ – 36 ¼ inches 40 bra band
36 ½ – 38 ¼ inches 42 bra band
38 ½ – 42 ¼ inches 44 bra band
42 ½ – 44 ¼ inches 46 bra band
44 ½ – 46 ¼ inches 48 bra band
46 ½ – 48 ¼ inches 50 bra band
48 ½ – 50 ¼ inches 52 bra band

How to choose your cup size​

You can be any cup size you want to be. When you choose your cup size based on your bra band size (what your body says you are), you’re sure to find a size that looks natural on you. 

Remember, breast size is in proportion to your body, so if you’re wearing a bra band that’s smaller than your body, it won’t look in proportion!

Once you know what your bra band is and what your desired cup size is, you now have the bra size to shop for! Keep this in mind when you look for the best breast forms for your body.

Cup sizeLookBest for
AA cupUndeveloped breastsGoing ‘stealth’
A cupVery demureSlender frames who want to be petite
B cupProportionate but demureSmaller-busted looks; can be proportionate on slender frames
C cupProportionateLooks good on everyone
D cupProportionately curvyBustier but still natural; complimentary to bodies that carry more weight in their tummy
DD cupNoticeably bustyIdeal for a busty look without having to sohp for specialty bras
DDD/E cup or largerVery, very busty‘Top heavy’ or fantasy looks. Prepare to look for special ‘large bust’ or ‘full figure’ bras

Step 3: Choose your breast forms

Getting the right bra size makes breast forms look natural on your body

We have tailored all of our fitting and size charts to work better for cross dressers and transgender girls so that they can fit your skeletal structure more naturally.

Using your measurements

Using the two measurements that you originally took, find out the difference by subtracting your overbust measurement from your underbust measurement (not your bra band).

The number of inches that you have as a difference between these two measurements determines what type of breast form is best for your body.

Breast forms come in four variations: flat back, semi-flat back, semi-concave back, and concave back. Each of these back designs are designed to fit for a different amount of breast tissue or pec muscle on the body.

If you wear a breast form that is too flat, you may find that the edges peel away from your body (think book on a basketball), or if they are too concave, they may collapse on your chest. Getting the perfect fit also means you will have more success attaching or going braless!

Got a question?

If you’re not completely sure on what breast forms or bra size is best for you, let us know! Get in touch with one of our certified breast form fitters for the perfect fit, every time!