I carry a full size 1911 in a crossbreed IWB holster and love it. You also need a good stiff gun belt too.
SuperTuck® Deluxe | CrossBreed® Holsters - SuperTuck® Deluxe
So now someone's copying the Remora design too. I guess it was only a matter of time.HI, I had a problem with keeping my pants up with IWB holsters. Until I founded Sticky Holsters. It works very well and is very comfortable.
Sticky Holsters | Redefining Concealment
Now on my other holsters that I wear I have to use suspenders under my shirt and that just gets to hot in summer, so the Sticky Holster works great for summer.
Hope this helps
In which holster? In an IWB holster, gravity doesn't work against you when sitting down. Even if it did, the guns is almost always retained by the shape molded into a kydex shell. In the Ankle SoxXx, the tension of the elastic holds it in. According to the reviewers, it held far better than they expected. Besides, your gun isn't in an upside down position when you sit down anyway, so not that much tension would be required. The Remora is an IWB holster, but it's one of the few that has no kydex shell to grip the shape of the gun. But an IWB holster doesn't go horizontal when you sit, much less go upside down, so the normal surface tension of the gun in the holster, which is augmented by the squeezing force of your pants/belt, is more than enough to hold the gun in. I'm not personally familiar with Sticky Holsters, but since they're a copy of the Remora design, I assume the same principles would apply. If you start doing handstands or cartwheels however, well ..... maybe you shouldn't be carrying a gun right then anyway.what keeps the gun from sliding out when you sit down?