Caterpillar (CAT) Workwear Size Guide
How do Caterpillar sizes work?
Caterpillar sizes its workwear by body measurement in inches. Tops and jackets go by chest; trousers are sized by waist, and each trouser size fits a slightly different body waist, shown below.
Published 10 November 2026 · Updated 10 November 2026
Caterpillar body size charts in one place, from Caterpillar's own size chart, in inches: which size to order for jackets, tops and trousers.
Caterpillar sizes its workwear by body measurement in inches. Tops and jackets go by chest; trousers are sized by waist, and each trouser size fits a slightly different body waist, shown below. These are body measurements, so measure yourself and find the size. Every figure is from Caterpillar's own size chart, in inches.
How to measure
Chest. Around the fullest part of your chest, under the arms.
Waist. Around your natural waist.
Use a soft tape measure. If you fall between two sizes, go by your larger measurement.
Jackets, tops and coveralls
| Size | Chest (inches) | Waist (inches) |
|---|---|---|
| XS | 33-34 | 27-29 |
| S | 35-36 | 29-31 |
| M | 38-40 | 32-35 |
| L | 42-44 | 36-39 |
| XL | 46-48 | 41-44 |
| 2XL | 50-52 | 46-49 |
| 3XL | 54-56 | 50-53 |
| 4XL | 58-60 | 54-57 |
Trousers by letter size
| Size | Waist (inches) | Trouser size |
|---|---|---|
| XS | 27-29 | 28-29 |
| S | 29-31 | 30-31 |
| M | 32-35 | 32-34 |
| L | 36-39 | 36-38 |
| XL | 41-44 | 40-42 |
| 2XL | 46-49 | 44-46 |
| 3XL | 50-53 | 48-50 |
| 4XL | 54-57 | 52-54 |
Trousers by waist size
| Trouser size | Fits waist (inches) |
|---|---|
| 28 | 27-28 |
| 29 | 28-29 |
| 30 | 29-30 |
| 31 | 30-31 |
| 32 | 32-33 |
| 34 | 34-35 |
| 36 | 36-37 |
| 38 | 38-39 |
| 40 | 41-42 |
| 42 | 43-44 |
| 44 | 46-47 |
| 46 | 48-49 |
| 48 | 50-51 |
| 50 | 52-53 |
| 52 | 54-55 |
| 54 | 56-57 |
Fit varies a little from style to style, so each Caterpillar product page shows the chart for its own sizes.
Common questions
What CAT size is a 42 inch chest?
L. A Caterpillar L fits a 42 to 44 inch chest.
What waist does a size 36 Caterpillar trouser fit?
A 36 to 37 inch waist, by Caterpillar's own chart.