Body types: Fat v. skinny v. medium, etc.
Warning, if you are skinny, you might find the next line disturbing! :)
I'm 6'2", 340 lbs. Got Dunlop's disease with the worst just above the waist. Getting my belt to engage my hips is a tricky and elusive procedure. Weight of a cell phone, no problem. Weight of an H&K USP, different story. To hold that up, I have to take in the belt 1 2 or 3 notches, depending on IWB v. OWB. The butt of the gun is constantly being pushed out, causing it to print. Patterned shirts help a lot. Deep/low IWB carry is not an option for me, because it is painful. High rise carry makes the firearm flop around like a flounder.
My usual methods of carry in order of preference are fanny pack, IWB/OWB behind hip, belly band positioned around the chest (firearm under arm). Usual weapon is either the H&K or a Taurus 85CH .38.
I frequently hear skinny guys complain about it being difficult for them to carry, especially IWB, but I see it as easier.
What I'd like is a new and revolutionary type concealment holster that overcomes my obstacles, but is still convenient, comfortable, unobtrusive, and accessible.
I'd love to hear about other's trials and tribulations. What works and what doesn't.