The method to identify the authenticity of Govan down jackets is as follows:

1. Material quality: The outside of authentic Govan down jackets is made of waterproof material, usually nylon or polyester fiber, and the inside is made of waterproof material. It is filled with high-grade white goose down or duck down and feels soft.

2. Workmanship details: The workmanship of authentic Govan down jackets is very fine, and there are no flaws in the details.

3. Logo: The trademark of Govan down jacket is usually sewn on the inside of the clothes. It is of good quality, with clear letters and no spelling errors.