The Flat Society
Nearly every post-mastectomy garment is designed for reconstructed breasts or prosthetics. Breast cancer survivors who live flat deserve apparel engineered for their bodies, not adapted from someone else's.
After mastectomy, some patients choose to remain flat and live flat. No implant, no tissue rearrangement, no prosthetics — a chosen outcome. Then they walk into a $121.75M adjacent market where nothing functional has been built for the needs this body creates.†
The surgeon closes the chest wall smooth after mastectomy. No implant. No tissue rearrangement. Recovery is expected to be faster. No future surgeries to replace implants.
Definition: NCI Dictionary of Cancer Terms"Putting on a garment every day — something made for a two cup design — is a difficult reminder."
Participant quote · AFC Survivor · InterviewThey weighed the risks. They made the choice. They didn't want to be hidden or corrected. That choice resolved one problem. A second appeared every single day.
"I chose aesthetic flat closure — and not prosthetics — because I felt like something huge happened to me and I did not want to pretend that it didn't through the use of prosthetics."
Participant quote · AFC Survivor · Interview"I thought about reconstruction at first…[but I] kept thinking about what happens if there are problems afterwards."
Participant quote · AFC Survivor · InterviewAfter AFC, the body's topography changes in ways non-specialized garments were never built to support.
"Soft, tailored for the 'indentation' instead of 'breast bumps' that most tops have for women. I used to love shopping for clothes, now I have panic attacks when I enter a fitting room."
Participant quote · AFC Survivor · Survey"I would like to be able to smooth the appearance of my chest."
Participant quote · AFC Survivor · Interview
5 survivor volunteers helped us better understand chest wall surface variation through 3D imaging. These references make visible what the word "flat" tends to obscure: contour, asymmetry, and variation across individuals.
Front
Left lateral
Right lateral
3D scan references used to study surface variation and garment fit requirements. Flat Society study, 5 scans. Research imagery, not clinical documentation.
What survivors told us, across interviews, a survey, and 3D torso imaging scans. The findings are consistent. The gap is undeniable.
Finding clothing that fits and flatters is difficult
Participants described shopping as financially and emotionally costly, often clearing entire wardrobes after surgery or radiation.
16 out of 18 survey participantsThere is a need for a functional garment for people who have chosen flat closure and no prosthetics
Across lived experience, geography, and years post-surgery, respondents arrived at the same conclusion independently.
16 out of 18 survey participantsFlat-specific construction as a core requirement
No darts. No built-in cups. No seams at the scar line. No elastic at the underarm. These are not style preferences. They are anatomical necessities that surgery creates and existing garments ignore.
16 out of 22 participantsU.S. breast prosthetics in 2024 — a category that doesn't yet include functional flat apparel
Syndicated market data tracks prosthetics and reconstruction products — flat-specific apparel is not a named category. Flatwear clothing exists, but no brand in our audit is engineering for the functional needs of AFC anatomy. That gap is what our research confirmed.
Grand View Research · U.S. Breast Prosthetic Market"There are no undergarments on the market that feel like they are made for my new, breast-less shape."
Participant quote · AFC Survivor · InterviewWe are not adapting existing products. We are engineering from the anatomy up — using 3D torso scan data, mixed-methods research, and an AFC survivor at the design table.
We are in the research and prototyping phase, seeking aligned fabrication partners and mission-driven collaborators.
Every design decision traceable to survivor feedback.
Adjacent U.S. breast prosthetic market: $121.75M in 2024. Flatwear clothing exists — functional flatwear doesn't. The position is open.
The customer is a founder. The need is documented. The category doesn't exist yet.
Kristina chose aesthetic flat closure after mastectomy and found herself navigating a market that had nothing for her. Her lived experience is central to this work — she brings proximity and perspective that shapes how the research is interpreted and what the garment will need to do.
Read Kristina's story Primary research instrument · Garment review lead · Survivor perspective
Erin designed and conducted the mixed-methods study, built the 3D imaging protocol, and is translating the findings into a design language. She brought research structure to a gap the industry had not named.
Study design · 3D imaging protocol · Mixed-methods analysisThe Flat Society
We are in the prototype phase, building the design language, finding fabrication partners, and seeking aligned collaborators who understand that this is both a human need and a functional gap that remains unaddressed.
Help shape research and future product direction through lived insight.
Be the first to know as we move from prototype to product — fit updates, launch news, and early access.
For collaborators, funders, and product partners helping build what is missing.
Research & Data Notes
† Incidence: The American Cancer Society estimates 321,910 new invasive breast cancer cases in U.S. women in 2026. Source: ACS Key Statistics for Breast Cancer
† Historical context: In a cohort of 20,560 U.S. women undergoing mastectomy between 1998 and 2007, reconstruction use increased from 46% to 63% (Jagsi et al., Journal of Clinical Oncology). This reflects historical trends, not current adoption rates. Source: Jagsi et al. · Journal of Clinical Oncology · MarketScan database
† Patient satisfaction: A 2021 study published via Breastcancer.org found that 74% of 931 women surveyed in Going Flat communities reported satisfaction with their surgical outcome after mastectomy without reconstruction. Source: Breastcancer.org . Most Women Satisfied With Choice to Go Flat, 2021
† Market context: Grand View Research estimated the adjacent U.S. breast prosthetic market at $121.75M in 2024 (projected $241.11M by 2033). The "0" reflects our competitive audit of products reviewed — not a claim about the complete universe of post-mastectomy garments. Source: Grand View Research · U.S. Breast Prosthetic Market
AFC definition: Aesthetic flat closure is defined by the National Cancer Institute as removing extra tissue and smoothing the chest wall so it appears flat. Source: NCI Dictionary of Cancer Terms
Primary Research: All percentage figures (73%, 82%, 89%) are derived from The Flat Society's own mixed-methods study of 22 participants: 5 in-depth interviews, 1 structured survey with 17 responses, 5 3D torso imaging sessions. All participant quotes reproduced with permission and used as research evidence, not marketing material.
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