My normal carry has been a SW J frame .38 spcl. I have one leather OWB that has a thumb break and the rest have none. I also have Kydex IWBs and paddles that don't. I have no experience carrying my 1911 Springfield Range Officer with 5" barrel. What advice regarding a thumb break for a leather IWB. I have ordered a MTR Custom Leather A-1+ Deluxe Thoroughbred Holster. I can still modify my order to include the thumb break.
Thanks John

It's not necessary. Most holsters today are completely open top and no one has had issues with ND.

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Retention is rarely a problem for non-LEO or non-military carry.

If you might be involved in some activity that could result in your gun falling out or being knocked out, then thumb break might be good idea.

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I've still got it made.

Unless you're walking in the woods, or otherwise doing a whole lot of creeping/crawling/climbing/lifting, no problem.

Gonna be a bit of an adjustment going from a svelte J-frame to a full-size 1911.

I may just go right back to the J frame.
John

But, ya never know unless you try!

And hey, it's not like there isn't near-infinite choice in between one and the other.

I can't imagine using a thumb break holster for a 1911.

Thanks to all for the good advice and comments. All of the good replies helped me decide to not get it. I am 74, over the hill and picking up speed so I don't plan on running, certainly not AFTER someone. The .45 is why to not have to run away from someone.
Thanks
John