The issue is that for some of us, a belt carry weapon doesn't work. The anatomical profile is similar to a funnel, the stomach is the large end, and your knees the smaller. No, a heavy gun in a belt holster doesn't work. Not.
Continuing to recommend it to someone who has been told by his doctor (the OP in this case) means a serious reading comprehension issue exists. Somebody didn't bother to read.
I have been using the "ace bandage" style holster for over a year now, and gave it a first trial on a vacation in June to the beach. I wore it all day every day except when I knew I would be in the surf. They are very comfortable, no stiff leather, no buckles, and fit well if you read the directions to adjust them carefully. They don't slide around the way leather or nylon fabric holsters do, but can be moved discreetly to a slightly different position. Was it sweaty? I wore it directly next to the skin, and, yes it was. I have other holsters with broad bands of fabric and leather, they cover a lot of skin, they get sweaty, too. When I was humping full battle rattle in Egypt on a two weeker on check point duty, that got sweaty too. If it covers the skin, it can get sweaty. OK? Expect it and deal with it. After the second day I got over it.
You have a choice, wear a shoulder holster that might be "sweaty" or wear a belt holster that might get really breezy at an inopportune moment. Take your pick.
The model I used was a multi layer sewn arrangement and when I would remove it felt moist to the touch, but would dry very quickly. After 6 days constant use - no odor. I have yet to wash it. The makers of most of these say pop them in the washer if needed, or hand wash. A leather or nylon holster won't suffer it.
There is one caveat - most don't make holsters suitable for full size double stack duty guns in full metal construction. Every one seems to remark reconsidering what is being asked - as one poster mentioned, the gun makers DID come up with some new materials in frame fabrication, and I'm sure I'm not the first to suggest that maybe a different caliber cartridge could be considered. The gun I was carrying weighed 11 oz unloaded, which is a significant difference compared to my largest handgun, an S&W .45 at over 35 oz empty.
If we have to recognize and deal with the reality of altering how we carry, then it's not a big step to recognizing and altering the more significant issue - big heavy all metal full size metal firearms are the the other half of the problem. I can carry the 11 oz gun in a suede IWB holster for longer periods than the 35 oz gun. And with less adjusting.
I still prefer the shoulder holster as the pants issues with larger waistlines to fit a gun IWB are exactly what you DON'T want to do with them in this situation. If anything they need to fit comfortably snug with some friction to help hold them up. Consider pants that use stretch fabric - Wrangler makes jeans that do, as does 511. They are more comfortable and work with you instead of limiting your range of motion. And it goes for all the EDC in the pockets, too. A double stack duty mag of ammo in one, flashlight, large knife, wallet with 45 credit cards, etc isn't helpful either. Better to reconsider it all, which I did and eliminated half the weight.
I haven't put much money into belt holsters in the last few years - I buy shoulder holsters for hunting and street carry now. The work fine, I'm not planning on scuffling or detaining anyone. I work on being aware of the situation than to get blindsided and I just don't go some places at the wrong time, unlike some younger guys who seem to enjoy elevating their risk. Shoulder holsters work just fine, and there is a reason they were popular in the days before competition belt holsters and tactics became popular on the street - with their accompanying negative issues.
