The Complete Guide to Bra Fit: Understanding Projection & Fullness

By Lauren Scott

Have you ever noticed that two people wearing the exact same bra size can have completely different results when trying on the same style? The reason goes beyond the size label — every person has a unique breast shape that affects how a bra fits and feels.

A truly comfortable and supportive bra is not only about choosing the right measurement. It also depends on understanding important factors such as projection, fullness, and breast roots.

In our previous guides, we explored how to accurately measure your bra size and how your natural breast shape and roots can influence the way different bras fit. Now, it’s time to take a closer look at projection and fullness — two essential elements that can help you find a bra that doesn’t just fit your body, but feels like it was designed specifically for you.

What is Breast Projection?

What Is Projection?

Projection refers to how much your breasts extend outward from your chest. It is not determined by breast size or cup volume alone. A person with a smaller cup size can still have a projected shape, while someone with a larger cup size may have a shallower shape.

A simple way to visualize this is to imagine two people with the same amount of breast tissue. One person’s shape may resemble a wide, flat plate, spreading more across the chest (shallow), while the other may have a shape closer to a tall glass, with more depth extending forward (projected).

Shallow Breasts

With a shallow breast shape, the tissue is distributed across a wider area of the chest rather than extending significantly outward. This creates a broader, flatter appearance from the side view. Even those with a larger cup size can have shallow breasts if their volume is spread more evenly across the chest instead of projecting forward.

Signs You May Have Shallow Breasts:

• You frequently notice empty space or gaping near the top of the bra cups, especially with styles that feature horizontal seams.
• The bra size recommended based on your measurements may feel surprisingly larger than you expected.
• The underwire may feel uncomfortable and press into the area near your armpits due to the wider cup shape.

Best Bra Styles for Shallow Breasts:

• Look for cups with vertical seams rather than horizontal seams, as they help create a better shape and support.
• Choose bras with a top edge that is closer to a straight or horizontal line instead of a steep curve.
• Bras with a more open cup design (where the top edge extends outward rather than curving inward) are usually more suitable for shallow breast shapes.

If you have a shallow breast shape and often experience cup gaps, Comfelie’s wire-free bras featuring 3D Petal Cup technology help contour naturally to your curves, eliminating unwanted space while providing gentle support without any uncomfortable pressure.

Projected Breasts

Projected breasts have a narrower breast base and extend more prominently outward from the chest. Compared to shallow shapes, they have greater depth and a more forward-facing profile. They are often positioned closer together and require bras with enough cup depth to accommodate their natural shape.

Signs You May Have Projected Breasts:

• The center panel of your bra (the center gore) may not sit flat against your breastbone and can appear to lift away from your chest.
• You may notice breast tissue spilling over the top of the cups even when you are wearing what seems like the correct size.
• Your breasts may feel compressed inside the cups, creating a flattened appearance or a “uniboob” shape.

Best Bra Styles for Projected Breasts:

Choose bras with deeper cups that provide enough room for your natural breast shape. Styles with side support panels can also be especially helpful, as they guide the breast tissue forward, improve support, and create a more defined shape.

Understanding Breast Fullness

Breast fullness describes where the breast tissue is concentrated in relation to the nipple. This can affect how a bra cup fits and which styles provide the best shape and comfort.

Fullness is usually evaluated in two ways:

• Vertical fullness: How breast tissue is distributed above and below the nipple.
• Horizontal fullness: Whether more tissue sits toward the center of the chest or toward the outer sides.

Vertical Fullness: Full on Top vs. Full on Bottom

To identify your vertical fullness, bend forward at about a 90-degree angle and observe your breast shape from the side.

• Full on Top (FoT): The majority of your breast tissue is positioned above the nipple area.
• Full on Bottom (FoB): More breast tissue is concentrated below the nipple.
• Even Fullness: The tissue is fairly balanced between the upper and lower parts of the breast.

Full on Top (FoT)

If you have a full-on-top breast shape, bras with firm lace panels or tight, closed cup edges may create unwanted pressure and cause a “double-boob” effect. Styles with a more open cup shape, such as balconette or demi-cup bras, often work better because they provide a more natural fit around the upper breast area.

Full on Bottom (FoB)

A wide range of everyday bra styles are naturally suited for full-on-bottom breast shapes. However, bras designed with extra space and volume at the top of the cup (such as styles intended for full-on-top shapes) may leave empty space or cause the cup to gape at the upper edge.

Horizontal Fullness (Center-full vs. Side-full)

This describes whether your breast tissue is concentrated towards the center or the sides of your body. You can check this by gently lifting your breasts with your hands.

• Center-full: Tissue is concentrated towards the middle, often touching or close together.
• Side-full: Tissue is mostly on the sides, near your armpits, with a wider space between your breasts.
• Even Fullness: Tissue is evenly distributed from side to side.

If you are center-full, you may find that some plunge bras don’t provide enough coverage in the middle, while side-full breasts may require bras with wider-set underwires.

The Perfect Bra for Every Breast Shape with Comfelie

Every breast shape is unique and deserves to be embraced and supported. Instead of forcing your body into traditional bras with rigid underwires, let Comfelie deliver a new level of comfort and confidence:

🌸 Flexible 3D Cups: Designed to adapt naturally to different breast shapes, including both shallow and projected breasts.

🍃 Exceptional Breathability: Say goodbye to uncomfortable sweat and irritation under the bust.

🕊️ Pressure-Reducing Shoulder Straps: Help prevent digging, discomfort, and provide gentle support for a lifted look.

👉 Experience the difference today at: Comfelie.com

In short: This approach helps shift the reader’s mindset from “Now I understand my breast shape” to “I need a Comfelie bra to get the perfect fit and comfort I deserve!”