These jackets are sold in US based “alpha” sizes, so selecting a size is basically pretty easy. The size Medium and XL jackets fit Huey and Dewey, our Fit Check mannequins very nicely! Also, we checked several sizes with a tape. We found the sizing to be comparable to standard men’s clothing sizes. So our primary advice would be to choose the size you normally wear in men’s clothing.
Alpinestars publishes a super-complicated size chart which can be used to pick a size based upon your chest and waist. We’ve condensed their chart down to make it easy to read (see below). You can use this size chart to check your own measurements against the size chart to make sure the size you select will work. Choose a size that is big enough for both your chest and belly.
The max waist of a jacket style like this is only a couple inches smaller than the max chest and the bottom waist band is stretchy, so the style is very forgiving in case you have a bit of a belly.
| Jacket Size | Chest Range | Waist/Belly Range |
|---|---|---|
| Small | 38 | 36 |
| Medium | 41 | 39 |
| Large | 43 | 41 |
| XL | 46 | 44 |
| XXL | 49 | 47 |
| XXXL | 51 | 49 |
| XXXXL | 53 | 51 |