The Pain-Free Underwear Revolution
By Holly Zhang, Founder Diddi and Bea
For me, it started with a seemingly ordinary side kick — a movement I had performed thousands of times throughout more than two decades of martial arts training. But one quiet morning in my office gym, something felt different. The kick triggered a sudden sharp pain deep in my groin, and I immediately knew something was wrong.
Three weeks later, I was diagnosed with an inguinal hernia. What I expected would be a straightforward recovery quickly became much more complicated. One surgery turned into three, followed by a year and a half of rehabilitation that included pelvic floor physiotherapy, acupuncture, yoga, movement retraining, and major lifestyle adjustments. Recovery was not just physical — it changed the way I moved through everyday life.
And one of the biggest surprises was underwear.
The Clothing Problem Nobody Talks About
During recovery, I quickly realized how much pressure and irritation clothing can place on the pelvis, hips, groin, and nervous system.
Flowy pants, skirts, and dresses became my go-to because they reduced compression and friction. But underwear was a completely different challenge.
I tried nearly every “comfortable” style I could find. I sized up. I purchased seamless options. I tested softer fabrics and stretchier materials. Yet no matter what I wore, I still experienced pain and irritation around my hip crease and groin.
The problem wasn’t always the fabric itself — it was the construction.
Most underwear is designed with elasticized leg openings and seams that pull inward across the pelvis and hip crease. Even underwear marketed as “seamless” often contains bonded edges or tension points that create pressure on sensitive tissues.
For someone recovering from pelvic injury or living with pelvic pain, that pressure can be surprisingly aggravating.
Why Underwear Can Trigger Pelvic Pain Symptoms
This is something many people — including healthcare providers — rarely discuss.
The pelvis contains an intricate network of muscles, connective tissue, fascia, and nerves. Several important nerves travel through the groin and hip crease region, including branches associated with the:
- Pudendal nerve
- Ilioinguinal nerve
- Genitofemoral nerve
- Obturator nerve
- Lateral femoral cutaneous nerve
When tissues and nerves become sensitized after surgery, injury, chronic pain conditions, or pelvic floor dysfunction, even small amounts of pressure can become uncomfortable.
For individuals living with conditions such as:
- Chronic pelvic pain
- Vulvodynia
- Lichen sclerosus
- Interstitial cystitis/bladder pain syndrome
- Pudendal neuralgia
- Endometriosis
- Pelvic floor tension
- Postpartum pelvic pain
- Scar sensitivity after surgery
…tight elastics, compressive seams, friction, and pulling across the groin can worsen symptoms significantly.
What many people interpret as “sensitive skin” is often much more complex. Sometimes it is actually nervous system sensitization, tissue irritation, or mechanical pressure on already sensitive structures.
Designing Underwear Differently
As I struggled to find anything that worked, I found myself returning to a skill my mother taught me as a child: sewing.
I spent months testing patterns, fabrics, seam placements, tension levels, and shapes. My goal was simple: create underwear that reduced pressure instead of creating it.
Eventually, I developed a design that finally felt different.
The most important innovation was eliminating the traditional triangular front panel and tight elastic edges commonly found in standard underwear. In many designs, these seams create a pulling force from the crotch outward toward the hip crease — exactly where many sensitive nerves and tissues are located.
Instead, I focused on:
- Reducing tension across the hip crease
- Eliminating unnecessary compression
- Minimizing friction and pulling
- Creating softer, more adaptable support
- Using fabrics and construction methods that moved with the body instead of against it
For the first time since my surgeries, I could wear underwear without constantly thinking about it.
And when you live with pelvic pain, that kind of relief matters more than people realize.
A Personal Solution That Helped Others
At first, I made the underwear only for myself.
Then I shared pairs with friends. Later, I brought them to fellow patients at my pelvic floor physiotherapy clinic.
The response was overwhelming.
Again and again, women described the same experience:
- Regular underwear caused irritation
- Elastic leg openings triggered pain
- Seams aggravated symptoms
- Tightness increased pelvic tension
- Clothing affected their ability to sit, move, work, or function comfortably
What I had believed was a personal frustration turned out to be an incredibly common — but rarely discussed — issue.
Many people living with pelvic pain spend years modifying clothing, avoiding certain fabrics, sizing up, or simply tolerating discomfort because they assume there are no alternatives.
An Unexpected Path
I never planned to become an entrepreneur.
This journey began with injury, recovery, frustration, and the search for comfort in my own body again. But life has a way of redirecting us toward things we never expected.
Today, what keeps me going is knowing these designs may help someone else feel more comfortable, more supported, and less alone in their experience.
Because for people living with pelvic pain, even something as simple as underwear can make a difference.




