Why Does My Button Up Shirt Gap at the Chest? Fixes
By For the Sport of Business® | Published: 2026-10-17
Category: Tips & Care
Chest gap in a button-up shirt is a common fit problem. Learn the likely cause and how to fix it with the right shirt choice or tailoring.
Quick answer
Chest gap happens when a shirt is too tight across the chest or too loose at the waist, causing fabric to pull at the buttons. The fix is to choose a shirt with a wider chest measurement and a tapered waist, or one made from stretch fabric like PYCA Pro® that moves with you.
What causes the gap?
The most common cause is a mismatch between your chest size and the shirt's cut. If your chest is broader than the shirt's design allows, the fabric pulls horizontally, creating a gap between buttons. This is especially common in slim-fit or tailored shirts that prioritize a narrow waist over chest room. The fabric type also matters: stiff cotton lacks give, so any tension shows as a gap.
Another cause is the button placement. If buttons are set too far apart or too close to the edge of the placket, even a well-fitted shirt can gap. This is a design issue, not a fit issue, and it means the shirt itself is the problem.
How to fix it without replacing your shirt
If you already own the shirt, the most reliable fix is to have it tailored. A tailor can add a hidden snap or hook-and-eye closure between the problem buttons, or take in the waist so the chest fits without pulling. This costs less than a new shirt and works for most body types.
Another temporary solution is to wear an undershirt that reduces friction and hides minor gapping. But this doesn't solve the structural issue—it only masks it.
Diagnosis: Is your shirt fixable or a lost cause?
- Symptom: Buttons pull open when you sit, reach, or take a deep breath. The gap appears at chest level, usually between the second and third buttons. This is a fit or design issue, not a washing or care problem.
- Likely cause: The shirt's chest measurement is too small for yours, or the buttons are placed too far apart. Stiff fabric without stretch makes it worse. Check the shirt's chest measurement vs. yours. If it's less than 4 inches larger than your chest, gapping is likely.
- Corrective action: Option 1: Buy a shirt with stretch fabric and a chest measurement that accommodates your size. Option 2: Have a tailor add a hidden closure. Option 3: Size up and take in the waist. If the shirt has no stretch and you can't tailor it, replace it. No amount of layering will fix a structural gap.
Shirts built to prevent gapping
- AO Long Sleeve Button Up | Pacific Blue Signature-Fit PYCA Pro®: Designed to be Always On, the Pacific Blue AO Long Sleeve Button Up combines a refined true navy color with the comfort of PYCA Pro® fabric. Breathable stretch, wrinkle-resistant performance, and a clean tailored silhouette make it an effortless choice from meetings to weekends. The PYCA Pro® fabric's four-way stretch allows the shirt to move with your body, reducing tension across the chest that causes gapping. The tailored silhouette also keeps the waist trim without forcing the chest to pull.
- AO Long Sleeve Button Up | Black Signature-Fit PYCA Pro®: Designed to be Always On, the Black AO Long Sleeve Button Up delivers the polished look of a dress shirt with the comfort of your favorite tee. Made with PYCA Pro® fabric, it offers buttery-soft comfort, wrinkle resistance, and four-way stretch for effortless versatility from work to nights out. Same stretch technology in a classic black. If you need a shirt that adapts to movement throughout the day, this eliminates the pulling that causes gaps.
