I think there is a concensus on what constitutes a pocket - but it's not carved in stone.
The front pocket of a common pair of jeans, or business slacks (Dockers) - is a pocket.
These threads always have someone who throws a Glock 26 or Nano (now it's also the Shield) in their cargo pockets and declare the pistol a "Pocket Pistol"
Seems to be more of a Regional or Stereotypical thing than anything else. Personally, I haven't worn a pair of blue jeans in over a decade. Where I live, they are too hot, making them flat out uncomfortable, and they give you absolutely no storage options for the many things that a modern man carries; like a wallet, cell phone, keys, pocket knife, and a reload. Most men in my area are dressed in some sort of Cargo shorts/pants or other outdoor style clothing because they are comfortable and much more accommodating to how we live. It doesn't matter the age, they are a standard dress staple for the masses down here, which is something that I'll gladly embrace.
Cargo pants, shorts work well to hide a larger gun in pocket carry b/c the side pocket interferes with the lines of the gun and helps to break it up. Wear a good gun belt to support the weight (as you should when carrying anything lighter than a pea-shooter) and stick your hands into the pockets of any pants/shorts you intend to buy.
Personally, I've been carrying a G26 in my front pocket for 8 years now. Never been made, no one looks at me strange for wearing cargo shorts/pants, and given the pistol's firing traits (trigger, grip, dual recoil spring/ recoil management, and accuracy out to 25 yards), it is much more worthy of being a primary sidearm than many of the tiny wonderguns that have become popular as of late.
When I absolutely have to wear dress slacks, I bust out the Seecamp. For everything else, the G26 is it.
To the OP, if the Glock 26 works for you, then I think you will be hard pressed to find a 9mm pistol that displaces it. The Baby Glock gives you a lot of versatility (sights, mags, holsters, aftermarket support) that you likely won't find in any other small sized 9mm. When it comes to pocket carry, most companies are missing one major point; it's the overall
height of the pistol that makes or breaks it as a pocket carry option. That's yet another reason why the G26 remains as
the sub-compact 9mm to beat. Frankly, I've just about given up on expecting a better option to hit the market.