Im 5'10 or 5'11 and weigh about 135lbs with clothes on so i'm skinny as ****, and I can carry my sig IWB with a pretty tight shirt thats soft as **** and you can't really tell its there, it does make a bit of a bulge but its so insignificant that i really can't see someone distinguishing that from just a wrinkle in my shirt since even I myself knowing its there can't see the outline enough to make out that its a gun. with a slightly looser shirt or a button down shirt im pretty sure there wouldn't be anything at all really. The sucky thing is of course that we live in Florida which is hot as hell, but one of the most important things about concealed carry is to dress around the gun so you're not really going to get around that unless you buy one of those miniature guns for women, idk about you guys but id rather carry a few extra ounces and know im carrying a good gun with a 15 round mag instead of something that looks like a girl should be carrying it in her thigh.
I have a P228 M11-A1, not to be confused with the original P228, this gun has the exact same dimensions as the P229 and even uses alot of the same parts but has been modified a bit further and comes with 2 flush fit 15 round mags and a stainless steel slide. Yes its heavier than a glock but that's because its all metal as opposed to cheap plastic, it also feels alot nicer and shoots better IMO, and honestly an extra 10 ounces is what half a pound? With my king tuck holster even i don't really feel the weight of the gun and as i pointed out earlier im a skinny dude and I don't use a gun belt. It also comes with a short reset trigger which makes the gun alot better to shoot, i personally dont like the DAO that glocks have. But yea it will run you about twice what a glock will, mine was about $800 or $900 since i had to do a transfer to an FFL as well, so if you don't want to spend that much on a gun that's a different story but i really dont think an extra 10 ounces will make a difference and sig sauer's are definitely better guns. I shot a glock once, feels like a toy gun. There's girls that carry a full size P226, i know a guy about my same size who also carries a full size P226 so the moral of the story is if you want to conceal it you probably can, obviously a full size gun will require some adjustments in the way you dress though which we might not find comfortable in 100 degree weather. I think a P229 or M11-A1 is a perfectly good carry gun, now if you want to wear shorts and skin tight clothes then i guess your only option would be a pocket pistol, but then again that discards glocks as well.
The way i see it is you buy a glock if you want to spend half the cash, you buy a sig if you want the better gun.
Remember that YOU know you have a gun on you so obviously you're going to be more paranoid about it, i really can't see anyone staring at your crotch/abdomen for long enough to notice anything and even if they do most people wont think its a gun unless you can see the outline clearly. Also worst case scenario if they notice you're carrying so what? It's illegal to flash your gun around, its not illegal for someone to see the outline or even see the gun itself if it was accidental now.