Spend the money and get a better carry rig. And what I mean by 'rig' is a holster, belt and accessory pouch that is designed to carry the gun in question concealed. Don't go cheap on the belt. Arguably, the belt is the most important part as far as comfort and reliable concealment is concerned. A 1911 ain't light, so get a belt designed to carry the weight of the gun. It will keep the gun where you want it to be and it will hold it tight against your body for better concealment without rolling away from the body at the top or sagging under the weight of the gun and holster.
You really need a better holster. Leather, synthetic, kydex, ... it doesn't matter what it's made of. A 1911 is going to cost you between $400 and $2000 depending on how deep your pockets are. If you are going to spend that kind of cash on a gun, then why would you want to carry it in a bargain basement generic 'Size 5' holster? I suggest that you find something that's made specifically for your gun. It's a 1911 so EVERYBODY in the firearms world makes a holster for a 1911.
I've been concealed carrying for over 20 years and what I look for in a concealed carry holster- in general terms- is the following:
A.)It's got to stay open when I pull the gun. If I can't reholster without fighting with the holster because it collapsed, I ain't buying that holster. There may be times (and there has been a couple over the years) where I feel the need to surreptitiously draw and have the gun in hand but still concealed (held under my coat, under the table in my lap, ...). If/when I find that it is unnecessary, I want to be able to reholster just as surreptitiously as I drew it.
B.) It's got to be tight enough that the gun can't come out- even when held up side down- but loose enough that I can draw from it without giving myself a wedgie. Between the holster fit and belt tension, my gun has to stay where I want it to be no matter what I do but still be readily accessible. There's too many horror stories about some CCW holder that had a gun fall out in a line at the grocery store or Walmart not to be concerned with retention. On the other hand, if you go overboard on retention, you can't get to it when you need it. I've found my 'happy place' on the issue with the combination of a snug fitting holster that's made for the gun in question and a good belt.
C.) The holster has to be designed so that I can obtain a shooting grip on the gun while it is still fully in the holster. If I need a concealed pistol, then I'm going to need it RIGHT NOW- not after I get done fiddling with my grip to get it sitting in my hand right so I can actually hit what I'm aiming at. If the gun sits too low or there's some part of the holster that interferes with my ability to do so, I ain't buying that holster.