Surgical Planning

Breast Implant Size: Choosing by Body Type, Not cc

UNE Plastic Surgery · Dr. Kim Uigeon, board-certified plastic surgeon · Published 2026-09-21 · Updated 2026-09-21

1. Why cc alone should not set the size

The first thing measured is the breast base width. Once that width is fixed, the range of implants that can fit narrows naturally, and cc is chosen within it. Reverse the order and the result drifts. cc is one important input, but it cannot predict the final result on its own: at the same 300 cc, the visible size and shape change with chest width, skin thickness, existing breast tissue, and implant profile. So before “how many cc,” the implant width, projection, skin laxity, and desired volume that suit your body are confirmed together. cc is only the volume of the implant; at UNE the most commonly used range is 200–400 cc.

Chest width and breast base width

Chest width and breast base width set the range within which an implant sits naturally on the body. If the implant is too wide for the frame, it can look like it spreads outward or looks crowded; too narrow, and the volume change falls short. Even at the same cc, a different implant width and projection give a different breast shape — so consultation should confirm base width and implant profile, not cc alone. The High Five process, which organizes the decision order for fitting an implant to a patient’s tissue using five measurements, is the basis of this approach (Tebbetts & Adams, Plastic and Reconstructive Surgery, 2005).^[1] When 1,664 cases planned with this process were followed for up to 7 years, the overall reoperation rate was 3%, and reoperation to change size was 0.2%.

Why the same 300 cc looks different

The number 300 cc means the implant’s volume, not the final cup size or apparent size. On a narrow chest the same 300 cc can look large; on a wide chest it can look relatively small. Existing breast size, skin elasticity, implant profile, and placement can all make the same cc look like an entirely different result.

The four things actually measured

A consultation that quotes numbers without measuring has the order backwards. Four things are measured:

• Breast base width: the left-to-right width the breast occupies on the chest. The upper limit of implant diameter is set here.
• Skin laxity: how much give there is when the skin is stretched. Laxity accepts volume; a tight envelope limits size.
• Nipple-to-fold distance: whether the lower skin can accommodate the implant.
• Pinch test: pinching the upper-breast skin and tissue to gauge thickness. If thin, a plane with muscle coverage is chosen.

Profile: how far it projects at the same width

Profile is how far the implant projects forward. At the same width, a higher profile gives more volume, a lower one a gentler slope. Names differ by maker: Mentor (Xtra/Boost) uses Moderate Plus, Moderate High, and High; Motiva uses Mini, Demi, Full, and Corsé.^[7] The order is one: fix the diameter that fits the base width first, choose the profile that gives the desired volume within that width, and cc follows. So after consultation, it helps to write it as measurements — “base width 12 cm, diameter 11.5 cm, mid profile, 280 cc” — rather than “C cup.” A cup varies with underwear brand and underbust, but these numbers are the same everywhere.

2. The three elements that decide breast shape: footprint, conus, skin envelope

There is a framework for “why does the same implant give a different result in different people.” It reads breast shape as three elements (Blondeel et al., Plastic and Reconstructive Surgery, 2009),^[3] and a tent makes it quick to grasp.

• Footprint: the base area where the breast attaches to the chest wall — where the tent meets the ground. Surgery can barely move this footprint. If the left and right footprints differ, that difference stays in the result.
• Conus: the volume and shape of the breast sitting on the footprint — the canopy of the tent. The implant is the tool that changes this conus. A natural breast is fullest at the lower outer part and least at the inner upper, and in side view runs straight or slightly concave from clavicle to nipple.
• Skin envelope: the skin and subcutaneous fat wrapping the conus. Thickness is read by pinch, elasticity by stretch. An envelope smaller than the conus looks firm; larger, it looks drooped. The surgery that changes the envelope is a lift (mastopexy).

Consultation follows this order: measure the three elements, find which element creates the gap between the shape you want and the shape you have now, and choose the method that closes that gap. If the conus is short, an implant; if the envelope is loose, a lift; if the footprint differs, that limit is stated in advance. That is why “the shape you want is achievable, but one footprint sits higher, so perfect symmetry is difficult” is pointed out before surgery.

3. Choosing size by body type

A lean body often has thin skin or little existing breast tissue, so the chance of a visible implant edge or rippling has to be weighed too. Here, rather than a large implant, the size and projection that skin and tissue can support matter more. Too large an implant can add volume but feel unnatural or show its edge. So in a lean body, placement, tissue cover, and skin thickness are assessed alongside size.

A tall or wide-chested frame can make the same cc look relatively small, because the implant’s volume reads differently within the whole-body proportion and chest width. In these frames, rather than simply raising cc, implant width, profile, and overall proportion are considered together to balance desired volume against a natural ratio.

4. The volume called the “ballerina breast”

To state the conclusion first: “ballerina breast” is not the name of a separate surgical technique. It refers to a direction that aims for natural volume that does not exceed the body’s proportion. In a lean, narrow-chested frame like a ballerina’s, many people use the term for a result that does not show under clothing and continues the whole body line.

The name “Ballerina Breast” was first coined by British plastic surgeon Paul Banwell, for a direction using small implants of about 150–250 cc to make a light, delicate form.^[5] It spread widely on US TikTok from 2023 onward: riding a “balletcore” trend and the lean silhouette shaped by GLP-1 weight-loss drugs, “ballerina boobs” circulated, a year after “yoga boobs” was used for the same idea.^[6] The American Society of Plastic Surgeons, addressing the trend in a July 2026 article, framed it as “an aesthetic pointing to a smaller, lifted, proportionate breast, not a specific implant size,” and noted “there is no universal benchmark cc.”^[4] US surgeons say more patients now ask for a full B or C cup instead of a D.

So when this term comes up, two things are checked: whether that proportion actually comes from your current chest and tissue rather than the breast in a photo, and whether the goal is “small” or “undetectable” — which are not the same thing. For this goal the criteria are the same as above: set implant width within chest and base width, and set projection within what skin thickness and existing tissue can support. Many want a curve that runs gently from below the clavicle to the upper breast rather than an upper-pole that domes up; then, instead of raising cc, a low-to-mid profile and a dual plane or subfascial pocket^[2] come closer to the goal. One point is clear, though: in a lean body with thin tissue, going smaller is not automatically more natural. When tissue cover is short, even a small implant can show its edge or rippling — in which case a hybrid approach (implant plus fat grafting) that lowers implant volume and supplements the edge with autologous fat is also considered.

5. What to confirm in consultation

What is worth doing is taking the numbers home. Writing down how many cm your breast base width is and how many mm your tissue thickness is gives a reference for comparing elsewhere. When choosing size by body type, chest width, breast base width, skin thickness, existing breast tissue, left-right asymmetry, and desired volume are confirmed together — and a lean body, a wide chest, and thin skin each have different cautions.

• Did you confirm your current chest width and breast base width, rather than a target cup size?
• Is your skin thin or your breast tissue on the smaller side?
• Have you decided whether you want upper-pole volume or overall naturalness?
• If lean, did you discuss the chance of rippling or a visible implant edge?
• Do you understand that the same cc gives a different shape depending on profile?
• Was any left-right asymmetry or ptosis checked for as well?

6. Summary

1. Implant size is set first by chest width and breast base width, not the cc number. The High Five process, which decides from five measurements, is the basis.
2. The same 300 cc looks different in different people, and each body type has its own cautions: chest, base width, skin thickness, tissue volume, and profile all act at once. A lean body watches rippling and edge visibility; a wide chest looks relatively small; thin skin watches short tissue cover.
3. Breast shape is decided by three elements — footprint, conus, skin envelope. The footprint can barely be moved, the conus is changed by an implant, the envelope by a lift.

References

1. Tebbetts JB, Adams WP. Five critical decisions in breast augmentation using five measurements in 5 minutes: the high five decision support process. Plast Reconstr Surg. 2005;116(7):2005–2016. doi:10.1097/01.prs.0000191163.19379.63. (1,664 cases; overall reoperation 3%, size-change reoperation 0.2%.)
2. Tebbetts JB. Dual plane breast augmentation: optimizing implant-soft-tissue relationships in a wide range of breast types. Plast Reconstr Surg. 2001;107(5):1255–1272. doi:10.1097/00006534-200104150-00027.
3. Blondeel PN, Hijjawi J, Depypere H, Roche N, Van Landuyt K. Shaping the breast in aesthetic and reconstructive breast surgery: an easy three-step principle. Plast Reconstr Surg. 2009;123(2):455–462. doi:10.1097/PRS.0b013e3181954cc1. (Footprint, conus, skin envelope.)
4. American Society of Plastic Surgeons. The ballerina breast: why some augmentation patients are going smaller. plasticsurgery.org, July 16, 2026. (An aesthetic, not a specific size; no universal benchmark.)
5. Banwell P. Ballerina Breast. paulebanwell.com. (Coined the term; ~150–250 cc.)
6. NewBeauty. Are ‘Yoga Boobs’ and ‘Ballerina Breasts’ Just Clickbait? April 9, 2025. (“Yoga boobs” preceded it by a year; B–C cup preference.)
7. Motiva and Mentor implant line catalogs. (Base width, profile, and cc tables.)