Structured Twill Cap Size Chart
| SIZE |
CIRCUMFERENCE (in/cm) |
| Small/Medium | 21 ¼ - 22 ¾ / 54 - 58 |
| Large/ Extra Large | 22 ⅜ - 23 ⅞ / 57 - 61 |
- 100th Bomb Group Foundation
- Arrow206
- Association of Air Force Missileers
- B-24 Liberator Restoration Fund
- Betsy's Biscuit Bomber
- Bomber Command Museum of Canada
- British Phantom Aviation Group
- Canadian Warplane Heritage Museum
- Hawker Typhoon Preservation Group
- Heritage Flight Museum
- Hunter Fighter Collection
- Laguna's Spitfire Legacy
- National Air Force Museum of Canada
- South Dakota Air & Space Museum
- Tunison Foundation Inc
- Vintage Wings Inc.
- WWII Airborne Demonstration Team