Originally Posted by rednichols

That reply started out so well, with the neutral wax notion. Specially treating an IWB to waterproof it from sweat is not something I ever considered!

The plastic bag thing, though, to improve fit is an urban myth; likely started when folks were wetting their holsters but didn't want their real pistols to get wet and rusty when leaving it in the holster to dry overnite (or whatever). In ye olden days folks were told to grease the pistol.

The bag itself does absolutely nothing to improve the fit of the pistol to the holster; so as long as your holster is dry you won't need a bag. Oiling an IWB would seem to be a bad idea for you clothing :-). Neutral wax won't harm either the holster or the clothes.