I have considered to carry knife 'loose' in pocket, but I am actually worrying to loose it that way. Today I do not carry knife at work (I spend most of my day in front of computer or in some meetings) as it would look strange to have pocket clip showing. At the same time I do not dear to put a small knife (like Spyderco Air) in my pocket as the pockets on my suit pants (I do not wear the jacket to make use of more practical pockets) are shallow and the chance of a knife to slip out is high (I had smaller stuff falling out already).
I will soon have new set of pants tailored (I am apparently too slim for most 'production' suits and so I have to go 'custom'

) and actually consider to have a little narrow vertical inner pocket added to RFP where a small knife could be clipped without being seen from outside (this must sound pretty nutty to non-knife people I guess

)