Kappa identification method 2: Look at the logo. Kappa's logo is the image of a man and a woman sitting back to back. Authentic Kappa's logo works fine, and men and women can be distinguished from the logo image.
Kappa identification method 3: Look at the trademark. All kappa collar trademarks are inverted trapezoid, no matter what style. The inverted trapezoid has the word kappa and the size, and the X large under the word kappa is the size, which means XL is written in English. If it's m, it's MEDIUM. The square collar mark is fake because it is not inverted trapezoid. Sometimes the authentic bill will have no collar trademark.