I always find this topic somewhat sad and amusing at the same time. Being an adult, it's always sad to see when another adult in this case a spouse "prohibits" any activity which the other spouse might find enjoyable. I'm not talking illegal, immoral, or anything regarding those lines. But simply carrying, collecting, and use of a knife. It's mostly unreasonable and considered a controlling behavior, which in and of itself a deeper issue.
So long as the bills are paid, food on the table, and other responsibilities are taken care of why would there be a problem? Again in my case, as an adult I don't need to ask anyone for permission or approval to put something I own in my pocket or on my belt. I don't think I could handle being in a relationship like that, being treated like a kid instead of like a man isn't cool. Buy what you want, carry what you want, you're a grown man. By the way, does she know you are on the computer?