For what it's worth, in regards to "dressing nice" I snapped a few quick picks of a typical shirt I might wear tucked (though dark colored solids, and even my favorite light blue and light grey shirts work fine) with my EDC X9 and 18 round mag, making the grip roughly Glock 17 length.
Of course if I was tucking for work I'd wear a black belt and maybe put my cellphone where the clip is, and I'd also use the flush fitting 15 round mag. Also, the PJ Holster I'm using does have the thicker plastic clip, I'd be more likely to use a Vedder with the flat black clip that is much harder to notice against a black belt, or I'd order a jhook holster, depending on how deep I'd need to go. It's hard to tell from the picture but the guns outline is really not there even when doing various stretches, especially with the shorter mag, as I've said I've surprised my wife a few times after church when she was sure I left the gun at home, and she knows what and where I carry, and knows where to look.
Of course I'm not saying anyone can do it, or anyone is doing it wrong, I'm just offering options that others might not know exist or have considered, I know I dismissed tucking a holster for years until I tried.
5'8" 220 lb, if it matters.
I "agreed" because I see that it is true for many who CCW.Of the pistols I own, my #1 choice for SD would be Glock 20SF (10mm)
I can easily conceal a Glock 20SF AIWB wearing a hoodie/sweatshirt.
I can carry 20SF under a loose shirt with careful selection, some of my favorites wouldn't work.
2nd place to my Glock 20SF is Glock 23/32 and that is easily concealed under whatever shirt.
Glock 23/32 is not my "best" option but it is pretty good.
Using myself as an example, clothes are a factor in what handgun gets carried.
My point is that often "caliber war" is not about caliber, its really about clothes.
(I dislike the beaten cliche term "caliber war", try explaining it to someone not on a gun forum)
Often when people defend caliber or gun carried, they don't prefer the gun, they prefer the clothes.
But rarely to people just say, I'm not willing to (or can't) dress for whatever (bigger/better).
Cant and unwilling are not the same, I did use myself as an example of unwilling with the 20SF
A forum of mostly men use the disliked term "caliber war" because "clothes war" sounds...
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I "agreed" because I see that it is true for many who CCW.
I would also add that of those it is true for,MOST do not daily CCW !.
I CCW 24/7 and as such what I wear has VERY little to do with what I carry.
But never was I about to trade "fashion" or weather related clothing for my conceived safety [ in other words,my view of my safety,not others ]
Another factor is body flexibility as we all age.
Where we can put our firearms impacts which gun...and caliber.
For example, shoulder holsters are difficult now.
That reminds me...I should go take some yoga classes!