What Bra Size Is Billie Eilish?

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Billie Eilish is an American singer-songwriter who became famous in 2015. She’s also the youngest person to win a Grammy for album of the year in 2020. However, she sometimes faces body-shaming criticism due to her bust size.

I’m examining Billie Eilish’s bra size and how it influences her professional life and personal style.

What Bra Size Is Billie Eilish?

Billie Eilish’s bra size is 33B. This indicates that she uses bras with B cups to support her 33 to 34-inch bust and 28 to 30-inch band. She can also wear 30C and 34A bras as sister sizes.

Billie Eilish wears lace-trimmed ivory over a sheer top with a fur jacket around her arms having red nails and a ruby necklace in an event place

Billie Eilish’s body measurements are 40-27-37 inches. She is 5 ft 3 in and 127 pounds. She is known for her fashion of wearing baggy clothes, so you’d be forgiven for not knowing much about her figure.

Her hourglass figure gives her a natural 33B bust, a narrow waist, and wide hips, which is why the 21-year-old started wearing baggy clothing because of body image issues.

Typically, 33B should be rounded off to 32B. Thus, she has the same bust proportions as 22-year-old internet celebrity Belle Delphine, who wears 32B bras. Meanwhile, wrestler and actress Sasha Banks, who has a 34A bra size, can wear the same bra as Eilish.

Billie Eilish Measurements

Billie Eilish is shorter in height, measuring in at 5 feet 3 inches (5′ 3”). It’s estimated that her body measurements are 40-27-37 inches, which translates to a bust size of 40″, a waist size of 27″, and a hip size of 37”. She weighs roughly 126 pounds.

Benefits of Small Breasts

Don’t Have Back Pain

Ladies blessed with small breasts can avoid the dreaded back pain. Breast weight can cause your shoulders to move forward, which forces the muscles in your back and shoulder blades to adjust. Having less weight in front means your torso can easily carry your breasts, and the weight doesn’t need to be redistributed.

Can Easily Sleep On Your Stomach

Another advantage of having small breasts is that you can comfortably sleep on your stomach without it being painful on your chest. There’s no need to toss and turn at night to prevent squashing your breasts. It’s also fairly easy to choose sleep clothes, like lingeries and the best sleep bras.

Little to No Sagging

Gravity is the enemy of breasts, especially since it can cause sagging. However, it won’t affect small boobs as much, and your breasts won’t sag even if you go braless. Whether you have A or B cup breasts, your boobs will look naturally firm and perky as you age.

Drawbacks of Small Breasts

Don’t Always Fill Out Clothing

Despite its several benefits, among the most notable disadvantages of having small breasts is the chance that you won’t fill out bra cups or clothing. Particularly when the breast tissue is leaning toward the bottom, the shallow bustline can cause gaping cups.

Might Experience Breast Asymmetry

As you develop breasts, it’s normal for you to experience breast asymmetry. However, this can continue even as you reach adulthood, where the volume of one breast can be smaller than the other. There’s also the possibility that cleavage may veer toward the sides. When you are small chested, every ounce of breast size matters, so having different sized breasts can be frustrating.

Breasts Stay Small as You Gain Weight

If your breasts are dense with tissue, they won’t grow in size even as you gain weight. In turn, they may look significantly smaller as you gain more fat in other parts of your body. However, if you lose weight, the fat in your breasts may also reduce, causing your boobs to become even smaller.

Bra Size Measurement & Cup Size | A, B, C, D, DD Bra Sizes AND Extra Large Breasts


Billie Eilish has a bra size of 33B. This looks relatively big on her chest because of her slender figure and small height. Wearing balconette, plunge, or push-up bras for small-sized breasts can make her cleavage more prominent.


Allena is the Founder and Editor of The Better Fit, a platform dedicated to empowering women with practical advice on bras and fitness, inspired by her own revelation of the widespread issue of incorrect bra sizing. Her expertise and tips have been recognized by major publications such as Cosmopolitan, Better Homes & Gardens, Insider, and NBC, making her a trusted voice in women's wellness and lifestyle.