I have gone through many many holster, small of back, inside waist band, outside waistband, shoulder holsters, you name it and I have tried it. I got tired of having to buy pants/shorts that were 1-2 sizes bigger because when I didn't carry they would double over or fall off. About a year ago I bought an FFR from East, made to my specks for my Glock 26. It's a simple holster that rides on my hip in the 3-4 o'clock position, it never moves, and is comfortable for all day carry. I often forget it's there and have to do a hip check to make sure I brought it.
For your needs, you shouldn't have a problem concealing a 43, it's small, and unless you are only 100lbs, I can't see a way it will print or show. My sister carries a S&W bodyguard on her hip.
Everybody needs to think about open carry vs concealed, as there is a big difference. Most conceal carry holsters don't have a mechanical retention, they are simply friction lock holsters. That's fine for concealed, but for open carry that maes it very easy to have your weapon removed. Aside from that, if you're using a IWB holster now, how are you going to use that if you open carry? I'm not saying get a drop leg holster, because those are stupid, but consider how your clothing is going to change. I recommend a security level 1 holster, something that has either a thumb break, a finger switch to release the gun, or some other mechanical release. I don't want to hear that they are slower, I have a security level 3 that I wear everyday, that's 3 levels of security that have to be passed before the gun can be removed from the holster and I, just like all others that have to use these, can have the gun out and on target in under a second.
Off my