PGH resident here.
Carry whatever you want, (excluding outright prohibited weapons) just be sure to give a “legitimate lawful reason” for carrying, if a cop ever asks you why you have a knife.
Keep in mind that for knives, self-defense is NOT considered a legitimate lawful reason. Any statement you make saying how a knife is “for protection” or “self-defense” or anything like that, very likely will get you in trouble.
For small knives, “menial tasks” is a good enough reason for the cops. But for anything that city folk might consider “unreasonably large” be sure to have a provable, lawful reason to be carrying it.
I’m a prolific whittler. I do a ton of woodworking, and I prefer using larger fixed blades for my projects. As such, I carry a sturdy Buck. It serves me well, and, as long as I can prove I’m a woodworker (I always carry several ongoing projects in my bag) I have a legitimate lawful reason to carry this knife.
I’ve spoken with local cops, and they said I’m 100% in the clear with all this.
I carry the below items every day, concealed. I have a Sherrif-issued LTCF for the gun. A note about those permits: they do not cover knives. Your legal ability to carry a knife does not change once you get an LTCF permit.