This holster is made by Bladetech for Sig Sauer and sold by Sig Sauer. This holster is labeled an Inside Waistband Holster, however its primary and best use would be as an outside the waist holster. The holster comes pre-installed with belt loop attachments for outside the waist carry and also includes clips that can replace the belt loops. By turning these clips around the holster can be used as an inside the waist holster, however its best and most comfortable use is as an outside the waistband holster.
Note: This will only work on non-railed frames. if your 1911 has an accessory rail it will not fit the holster.