Everyone has a different definition when it comes to carrying a gun. For me I do not consider a gun to be a "Carry Gun" unless it is on your person everyday and everywhere you go. Leaving a gun in the car/truck is not a carry gun. Leaving it at home is not a carry gun. If it's not with you on your person then it's not a carry gun. The only exception is going into buildings that prohibit carrying a gun such as a government office building.
With that said carrying a full size or a mid size handgun doesn't fit my carry gun criteria 90% of the time where I live.
I have carried several different handguns since getting my CCW at age 18. Tried carrying a S&W Model 66 with a 6" barrel. That worked with a shoulder holster and me wearing a jacket or coat. Then I got my first Glock which was a model 23. That was better than the mod 66 for concealment but still a bit on the heavy side. Then I went to Walther PPK because they didn't have any 9mm/40S&W sub compacts at the time. When the ultra compacts came out I bought the Sig P290 and carried it for a very long time. About 2 years ago I picked up the P365 SAS and that's my current carry gun. The P290 is more accurate for me but the P365 carries quite a bit more ammo.
I have tried carrying handguns just about every way you can. Shoulder holsters, Small of back, cross draw, Strong side 9 O`clock, bellybands, and pocket carry. What I have found is that pocket carry is by far the most comfortable and it isn't as dependent on your choice of clothing. Doesn't matter if i'm in a suit or a pair of shorts. With my Sig P365 in my pocket and an extra mag in the opposite pocket I have everything I need. Doesn't require me to be using a special belt