M Gears Fit & Sizing Hub

Jacket Size Guide & Measurement Chart

Find your perfect fit. Compare your actual body chest against flat pit-to-pit jacket dimensions before you buy.

Crucial Fit Principle

The 4-Inch Comfort Rule

Jackets require extra room for unrestricted breathing, natural arm movement, and winter layering (sweaters, hoodies, or thermals). Your jacket chest should always measure roughly 4 inches larger than your bare body chest measurement.

If your Body Chest measures 40 inches, a jacket with a 22" Pit-to-Pit (44-inch jacket chest) from this chart will give you the perfect comfortable fitting with room for layering.

Jacket Size & Fit Conversion ChartStandard Fit (4-Inch Comfort Allowance)
Size TagJacket Pit-to-Pit (Flat)Recommended Body Chest
XS 19" - 19.5" 33" - 34"
S 20" - 20.5" 35" - 36"
M 21" - 21.5" 37" - 38"
L 22" - 23" 39" - 40"
XL 23.5" - 24.5" 41" - 42"
2XL 25" - 26" 43" - 45"
3XL 26.5" - 27.5" 46" - 48"
4XL 28" - 29" 49" - 51"
5XL 29.5" - 30.5" 52" - 54"

Note: Jacket Chest Circumference is double the Pit-to-Pit measurement (e.g., 22" Pit-to-Pit = 44" full jacket chest).

How to Take Accurate Measurements

Follow these two measurement steps to compare yourself against our jacket chart.

How to measure body chest
Step 01

How to Measure Your Body Chest

  • 1 Wrap a soft measuring tape horizontally around the fullest part of your bare or lightly clothed chest.
  • 2 Ensure the measuring tape stays level across your back and right beneath your armpits.
  • 3 Relax your arms naturally at your sides, breathe comfortably, and read the number in inches.
Tip: Keep the tape snug but not tight. Do not puff out your chest or hold your breath.
How to measure jacket pit to pit
Step 02

How to Measure Jacket Pit-to-Pit (Flat)

  • 1 Fasten all zippers or buttons completely and lay your best-fitting jacket flat on a table or bed.
  • 2 Smooth out any creases or folds without stretching the material.
  • 3 Measure directly across the chest from the lower armpit seam straight to the opposite armpit seam.
Calculation: Double the flat Pit-to-Pit number to get the jacket's total chest circumference.
Preloved Apparel Notice

Important Size Chart Guide — Read Before You Buy

Core Guidance

How to Use This Chart

Find your actual Body Chest measurement on the chart above to identify your ideal Size Tag and corresponding Pit-to-Pit jacket dimensions.

Layering Principle

The 4-Inch Comfort Rule

Jackets demand extra allowance for breathing and winter underlayers (sweaters, hoodies, knitwear).

Example: A 40" body chest matches a 22" Pit-to-Pit jacket (44" chest) for the optimal comfortable fit.
Brand Variations

Exact Item Details in Description

Because our catalog features premium international preloved brands, cuts vary between makers. The exact Pit-to-Pit, Length, and Sleeve measurements for every piece are recorded in its own product description.

Foolproof Verification

Best Practice Before Buying

Always inspect the exact Pit-to-Pit and Length measurements in the item's description and cross-check them against a jacket you already own prior to checkout.