What are the key takeaways from this Stuff You Should Know episode?

Key insights include: **Bra Sizing System:** The standard two-measurement cup sizing method, introduced by Maidenform in 1929, calculates cup size by subtracting underbust circumference from overbust circumference, with each inch of difference corresponding to one cup letter. Understanding "sister sizing" — that a 34C equals a 32D or 36B in cup volume — helps find better-fitting bras without changing cup size.; **Sports Bra Origin:** Two women invented the sports bra in 1977 by stitching together two jockstraps, creating the "jog bra" just years after Title IX passed. Before this invention, the absence of adequate breast support functionally excluded women from athletic participation, making the sports bra a direct enabler of women's entry into organized sports. The sports bra industry now generates roughly $7 billion annually.; **Bra-Burning Myth:** The widely repeated claim that feminists burned bras at a 1968 Atlantic City protest outside the Miss America pageant is false. Activist Carol Hanisch organized a "freedom trash can" where women discarded items including bras, false eyelashes, and lingerie, but no burning occurred. A reporter suggested the burning comparison as a reference to draft card protests, and the myth solidified from there.

How long is this episode of Stuff You Should Know?

This episode is 53 minutes long. SignalCast provides an AI-generated summary so you can get the key insights in about 3 minutes.

Stuff You Should Know

Selects: How Bras Work

October 3, 2026

53 min episode · 2 min read

Episode

53 min

Read time

2 min

Topics

Fundraising & VC, Design & UX, Science & Discovery

AI-Generated Summary

Published Oct 3, 2026

Key Takeaways

✓Bra Sizing System: The standard two-measurement cup sizing method, introduced by Maidenform in 1929, calculates cup size by subtracting underbust circumference from overbust circumference, with each inch of difference corresponding to one cup letter. Understanding "sister sizing" — that a 34C equals a 32D or 36B in cup volume — helps find better-fitting bras without changing cup size.
✓Sports Bra Origin: Two women invented the sports bra in 1977 by stitching together two jockstraps, creating the "jog bra" just years after Title IX passed. Before this invention, the absence of adequate breast support functionally excluded women from athletic participation, making the sports bra a direct enabler of women's entry into organized sports. The sports bra industry now generates roughly $7 billion annually.
✓Bra-Burning Myth: The widely repeated claim that feminists burned bras at a 1968 Atlantic City protest outside the Miss America pageant is false. Activist Carol Hanisch organized a "freedom trash can" where women discarded items including bras, false eyelashes, and lingerie, but no burning occurred. A reporter suggested the burning comparison as a reference to draft card protests, and the myth solidified from there.
✓Breast Support Science: A 15-year French study of 300 women aged 18 to 35 found that women who did not wear bras developed greater breast muscle tissue, providing natural support. Women who consistently wore bras showed less muscle development and higher rates of breast sagging — directly contradicting the conventional advice that bras prevent sagging over time.
✓Bra Manufacturing Scale: Each new bra design involves roughly 40 individual components — including straps, clasps, and underwire — and requires months of development involving dozens of specialists. Approximately 600 million bras are manufactured annually across around 26,000 distinct patterns. Historically, designs were standardized around one fitting model, Dorothy Galligan, whose 34B measurements became the industry baseline for decades.

What It Covers

Josh Clark and Chuck Bryant trace the full history of bras from a 2,400-year-old Sicilian mosaic through medieval linen discoveries, corset-era patents, World War I steel shortages, and the modern bespoke sizing revolution, covering design complexity, cultural stigma, and the persistent problem of poor fit across American manufacturing.

Key Questions Answered

•Bra Sizing System: The standard two-measurement cup sizing method, introduced by Maidenform in 1929, calculates cup size by subtracting underbust circumference from overbust circumference, with each inch of difference corresponding to one cup letter. Understanding "sister sizing" — that a 34C equals a 32D or 36B in cup volume — helps find better-fitting bras without changing cup size.
•Sports Bra Origin: Two women invented the sports bra in 1977 by stitching together two jockstraps, creating the "jog bra" just years after Title IX passed. Before this invention, the absence of adequate breast support functionally excluded women from athletic participation, making the sports bra a direct enabler of women's entry into organized sports. The sports bra industry now generates roughly $7 billion annually.
•Bra-Burning Myth: The widely repeated claim that feminists burned bras at a 1968 Atlantic City protest outside the Miss America pageant is false. Activist Carol Hanisch organized a "freedom trash can" where women discarded items including bras, false eyelashes, and lingerie, but no burning occurred. A reporter suggested the burning comparison as a reference to draft card protests, and the myth solidified from there.
•Breast Support Science: A 15-year French study of 300 women aged 18 to 35 found that women who did not wear bras developed greater breast muscle tissue, providing natural support. Women who consistently wore bras showed less muscle development and higher rates of breast sagging — directly contradicting the conventional advice that bras prevent sagging over time.
•Bra Manufacturing Scale: Each new bra design involves roughly 40 individual components — including straps, clasps, and underwire — and requires months of development involving dozens of specialists. Approximately 600 million bras are manufactured annually across around 26,000 distinct patterns. Historically, designs were standardized around one fitting model, Dorothy Galligan, whose 34B measurements became the industry baseline for decades.

Notable Moment

A 2008 archaeological excavation of an Austrian castle unearthed four linen bras estimated to be 600 to 700 years old — garments that looked unmistakably modern. The discovery overturned the long-held assumption that breast support design went directly from wrapped cloth to corsets with no intermediate development.

Know someone who'd find this useful?

Episode Transcript

00:00:00 Speaker 1: Hey everybody, it's Josh. And yeah, we did an episode on bras. What of it? Yeah, we're two dudes. But we're carrying on a long-standing tradition, we found out. Because it turns out that just about every bra in history, and then go back pretty far, was invented by a man. And that includes the guy who filed the patent for the first modern bra. This also explains why, until very recently, bras were profoundly uncomfortable and usually had some sort of lace or something. And maybe were see-through. That's neither here nor there, though, because in this episode, we cover everything there is to know about bras, and I feel like we came out of it as better people. I'll leave it to you to decide how we did. Either way, enjoy this episode from 2020 on bras. Welcome to Stuff You Should Know, a production of iHeartRadio. Hey, and welcome to the podcast. I'm Josh Clark, and there's Charles W. Chuck Bryant. And it's just us again. 00:01:07 Speaker 2: It's just us. 00:01:10 Speaker 1: We've lost Jerry. 00:01:12 Speaker 2: I'm in the studio like I was on the last one, but it's still a ghost studio. There's no one here. Sure. 00:01:19 Speaker 1: Except for Tommy Chong and the radio, or the record player, right? 00:01:25 Speaker 2: Sure. 00:01:26 Speaker 1: Good. We'll just leave it at that. We said that we have somebody poised to, like, scratch the needle off the record several episodes ago. Yeah, I remember that. And that it was Tommy Chong whose job it was to do that now. 00:01:43 Speaker 2: That's right. Good callback. 00:01:44 Speaker 1: Thank you. Should we talk bras? Yeah, we're talking bras, man, which I appreciate it when we do stuff like this, episodes like this, because we have to try harder because we're men, you know? Sure. 00:01:56 Speaker 2: Sure. 00:01:57 Speaker 1: The usual. 00:01:58 Speaker 2: It's the only time we have to try harder in life. 00:02:00 Speaker 1: Sadly, that is kind of true. But we haven't shied away from topics that have very little to do with us, like corsets. We did one on how corsets work. Do you remember that? We totally did. A whole episode on corsets. 00:02:17 Speaker 2: Jeez. 00:02:18 Speaker 1: We did one on female puberty. 00:02:22 Speaker 2: Yeah. Foot binding. 00:02:23 Speaker 1: Yeah. We've done a lot of them. So this is just— One in the same. A three is a lot when it comes to this kind of stuff. 00:02:32 Speaker 2: Yeah. No, I'm just kidding. And we did mention doing one on menstruation not too long ago. And we got a bunch of supportive emails saying like, yes, guys, please, please do that. Like, there's no reason why you shouldn't. 00:02:42 Speaker 1: I've been menstruating for 50 years and I still don't understand it. Please explain. 00:02:47 Speaker …

Get the full transcript (9,465 words) + summary by email — free

One-time email with the complete transcript and AI summary of this episode. No account needed.

One email, no spam. We’ll also show you what SignalCast does.

Browse all Stuff You Should Know transcripts →