FWIW, my knife is very obvious. I work EMS and my knife reflects that. Bright orange folder with a star of life on it. Clipped to my pocket and no one has batted an eye.
In my high school, in the late 70s, two of my friends made large Bowie-style knives in our Woods & Metals shop class. No one thought it was a big deal. One of them even used his knife project as the subject of his demonstration speech in English class, showing off the finished knife.
In Boy Scouts, when we gave kids their Tomahawk Badge, we always explained to them, that the badge does NOT mean they can take their knife to school.
The Tomahawk Badge? That predates me. Lol I got my whittling **** in Cub Scouts and we had the exact same conversation.