Some holster makers say you can wear a clip-retention holster without a belt, just clipped over your waistband, but I don't recommend this except for short times and distances. Your pant waistband cannot possibly offer any support, and there is nothing for the clip (except for Alessi's "Talon Clip") to hold onto. When you wear a belt, also be sure the lower portion of the clip is firmly hooked under it, or it can slip off when you draw the gun, leaving the holster attached to it.