Some design details on everyday clothing look decorative but actually started as functional fixes. The small pocket on women’s underwear and the pom-pom on winter hats are two good examples — both have a real, practical backstory that most people never learn.
The Pocket in Underwear: What It’s Actually For
That extra layer of fabric sewn into the crotch of most women’s underwear is called a gusset (sometimes a “liner”). It’s not a random design flourish — it’s there for two practical reasons.
Breathability
The gusset is almost always made of cotton, even on underwear that’s otherwise synthetic (lace, nylon, satin). Cotton is more breathable and absorbent than most synthetic fabrics, and that area of the body benefits from air circulation and moisture control more than most.
Hygiene and comfort
The gusset absorbs natural daily discharge, sweat, and moisture, keeping the rest of the underwear — and your clothing — cleaner and more comfortable. It’s a small design choice that does a lot of quiet, practical work.
The Pom-Pom on Hats: Where It Came From
The bobble (pom-pom) on top of a winter hat has a few competing origin stories, and the honest answer is that there isn’t one single confirmed explanation — but the most commonly cited ones are practical, not decorative.
A cushion against low ceilings
One popular explanation traces it to sailors on naval ships, where the pom-pom supposedly softened the blow when standing up too fast under low ceilings and beams below deck. This is the most repeated version, though it’s more folklore than documented fact.
A visual marker
Another theory ties it to French fishermen and trappers, who used different colored pom-poms to identify rank or group at a distance in bad weather or low visibility.
It stuck around because it works
Regardless of which origin story is most accurate, the pom-pom persisted because it’s functional in small ways — it can help keep the crown of a knit hat from unraveling, and it adds a bit of insulation and grip on top. Mostly today it’s just a style choice, but the practical roots are real.
Why Small Design Details Like This Matter
Neither of these facts changes how you get dressed, but they’re a reminder that a lot of “obvious” clothing design has a functional history behind it, not just aesthetics. Once you know to look for it, you start noticing it everywhere — the seam placement on jeans, the extra button inside a men’s dress shirt, the loop on the back of a button-down. Most of it traces back to a practical problem someone solved a long time ago.
Frequently Asked Questions
Is the underwear gusset always cotton?
Almost always, yes, even in underwear made from synthetic materials elsewhere. It’s considered a basic quality marker — underwear without a breathable gusset is generally worth avoiding for everyday wear.
Should the gusset be sewn in or removable?
Most everyday underwear has a sewn-in gusset. Some styles use a separate, sewn-on cotton lining rather than a woven-in panel — both function the same way.
Is there one confirmed origin for the hat pom-pom?
No single origin is definitively proven — historians and knitwear writers cite a few competing folk explanations, most involving sailors or fishermen. It’s a case of plausible tradition rather than documented fact.
Does the pom-pom serve any purpose today?
Mostly it’s decorative now, though it can offer a bit of extra warmth and helps some knit patterns hold their shape at the crown.
The Bottom Line
The underwear gusset is a genuine hygiene and comfort feature, almost always cotton for breathability. The hat pom-pom’s origin is murkier — likely practical once, mostly decorative now. Both are good examples of how ordinary clothing design often has more thought behind it than it seems.
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