I have carried 1911's in holsters designed for M9's, they fit a little loose due to frame size differences but it will work, especially if the holster has some adjustment on the thumb break.
Most off the shelf Molle holsters will fit several different guns even though the are marked for the M9.
You could get one of the custom gear makers to build you a similar holster specifically for the 1911, check places like the Roll Your Own forum on Lightfighter.net and ask what someone would charge to make you a holster to your specs.
For me BTDT, has turned into BTFT (Been There F*ck That).
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