I also have to wear a tie to work. I like to keep my pocket knife with a clip in my front pocket, but not have the clip showing. To do this you can use a small safety pin pinned horizontally inside the pocket close to the outter seem. Then slide you knife clip through the pin and it will stand vertically in you pocket and be invisible. I have also sewn a small piece of cloth into some pockets (works great and you don't have to worry about washing it).

Josh-184