"Leather scabbards and sheaths as well as leather covered handles should be treated with a good paste wax. The scabbard can also be treated with neatsfoot or mink oil for waterproofing, although this is not recommended for gripping surfaces. Do not store your sword in its scabbard for long periods of time since the leather traps moisture which can produce rust spots on the blade. One final note, the single most important thing when storing or displaying your sword or dagger is, if it has a leather scabbard, do not leave it in the scabbard. This goes even for stainless steel blades. It is, of course, fine to use a scabbard when carrying your weapon, but it simply should not be left in the scabbard for long periods of time, because it traps moisture and some tanning chemicals can have adverse reactions to metal over time."
-http://www.darkknightarmoury.com/t-Sword...
If you want a sheath for storage it seems like this would be a no go. If you want it to just have a sheath for the blade just because then you could probably display the blade out of the sheath and sheath nearby to show it as a pair. Oil the blade often with the latter option.
I recently acquired a longsword with a high carbon damascus (pattern welded) steel blade and I need a sheath made for it. The only place around me that could make one can only make one out of leather and I know you're not supposed to store swords in leather because it can trap in moisture. So I was wondering if putting holes in the sheath could help ventilate the sheath (not sure I used right wording). I know I saw a machete sheath like that.
