I use the 5-stitch instructor's belt. Great product:
http://www.thewilderness.com/
Also, I ordered my belt 4" larger than my waist size and it fits perfectly with my G19 IWB in a C-TAC.
http://www.thewilderness.com/
Also, I ordered my belt 4" larger than my waist size and it fits perfectly with my G19 IWB in a C-TAC.