It's easy as 1, 2, ... 

All you have to do is:

1. iron-on the Holster Patch on your desired item, and

2. sew around the edge of the patch for a more secure hold.

Ironing instruction for the Holster Patch.

1. Determine the location for the patch on your shirt
2. Set iron on "cotton" setting. (or "polyester" setting for spandex shirts)
3. Iron the shirt area until warm.
4. Place the Holster Patch on the pre-warmed area of the shirt.
5. Place iron on the Holster Patch and hold down firmly for 30 second while sliding iron across the patch. Pay special attention to the top and bottom of the elastic band.
6. Allow the Holster Patch to cool for 10 minutes before testing for good seal.

Repeat step 5, and iron the inside of the shirt if necessary.

Final step: Sewing the Holster Patch.

Sew completely around the edge of the Holster Patch to ensure that, in the slight chance, that the holster may peel of due to age and washing.

Caution: Garment should be laundered and dry before patching.

              Never exceed safe ironing temperature of the fabric being patched.