The High Visibility Alpha, High Visibility Omega and Smart Casual are based on the same size chart. This sizing fits between the High Visibility Sigma which is slightly more fitted and the Bomber jackets which have a looser fit.

| CHEST | SLEEVE | WAIST/HIP | |
| XS | 117.5 | 60 | 117.5 |
| S | 122.5 | 60.5 | 122.5 |
| M | 127.5 | 61 | 127.5 |
| L | 132.5 | 62.5 | 132.5 |
| XL | 137.5 | 64 | 137.5 |
| XXL | 142.5 | 64.5 | 142.5 |
| XXXL | 147.5 | 65 | 147.5 |
All sizes are expressed in cm